Having provided a top 10 list for URL shorteners just a week ago, it wasn't sitting quite right with me. IMHO there are three categories that are important to distinguish between. 1. Those who pay for ALL traffic, 2. Those who count multiple views up to a certain number of views, and 3. Those who count only unique views. In a way you could divide them into two subcategories as well, a) those who count unique visitors from your links, and b) those who count unique visits globally.
I don't have enough data to separate a from b at this point but I figured it at least deserved mentioning.

Those who count all views usually have lower CPM rates but if you have visitors who click on many of your links, it'll be worth it. These are my personal favorites.

Top 10 URL Shorteners That Count All views

1. clik.pw - Captcha: reCaptcha You can't go wrong with this one.
2. psl.io - Captcha: SolveMedia. Great shortener, do iiit!
3. coinarge.com - Captcha: SolveMedia. Another slam dunk!
4. u2s.io - Captcha: SolveMedia. New acquaintance, but already a favorite.
5. adbull.me - Captcha: reCaptcha. Another new acquaintance, but it seems really awesome.
6. urle.co - Captcha: None. If you want short links without captcha, this is THE ONE!
7. coin.mg - Captcha: SolveMedia. Solid shortener and CPM rate has been rising lately
8. vivads.net - Captcha: SolveMedia. Not sure about exactly how traffic is counted, but it has double the CPM rate of the other shorteners counting all traffic. So even if some traffic count is lost, the high CPM rate makes up for it in spades.
9. cryptosmo.com - Captcha: SolveMedia. I just found this one myself and I'll be trying it out in the days to come. It looks solid and I'm pretty certain I can recommend it just from the looks alone. Go ahead, give it a try.
10. coinb.ink - Captcha: reCaptcha. They've been in the game for a long time and is considered a solid performer. Somewhat lower CPM rate than the rest of the field but not so low that it should put you off without giving it a try.
11. bc.vc - Captcha: reCaptcha. This one is just included for completeness sake, CPM rate is all over the place. Depending on your traffic, it can be a good earner or a complete waste of resources. Analyze your traffic before you start using this in a serious way. It has the potential to be great but only for the right application.
12. zlshorte.net - Captcha: reCaptcha. This one is included for completeness sake. I've seen it getting decent reviews but I have my own personal reservations. It pays well and is supposed to count all views but it has a ton of popunders that activate while you're trying to solve the captcha. Use with caution...

Those who count multiple views from a visitor but caps the count at some arbitrary number will usually have higher CPM rates than those who count all traffic. It depends on your unique application which will earn you the most in the end. These are coming in a close second in my personal liking.

Top 10 URL Shorteners That Count Multiple Views of Visitors

1. adshort.co - Captcha: reCaptcha. Counts: 5 views/ip/24h. A personal favorite, it's just a solid earner and it seems to be great at counting traffic.
2. igram.im - Captcha: reCaptcha. Counts: 7 views/ip/24h. Almost as good as adshort.co, maybe you'll even like it better? It's a great shortener, definitely top tier, TRY IT or become sponge Bob square pants.
3. oke.io - Captcha: SolveMedia. Counts: 3 views/ip/24h. It's not THE greatest but it's certainly a top contender. Good choice in captcha, good CPM rates, good interface. It's just a overall good shortener and I like it.
4. linkshrink.net - Captcha: None. Counts: At least 4 views/ip/24h. If it wasn't for the low "lowest CPM" it would be great. Depending on where your traffic is from, it can earn great or it can suck. I don't particularly like the interface myself, but it's still ok. You should at the very least check it out and possibly give it a try to judge for yourself whether or not it's a good fit for your application.
5. shorte.st - Captcha: None. Counts: 5 views/ip/24h. I personally don't use shorte.st because of it's API, it's not necessarily bad but it doesn't play well with the other APIs that I use. It's been around for a long time and is considered by many as one of the best shorteners around. If nothing else, it's worth a look. With a different API I'd be using it...
6. adf.ly - Captcha: None. Counts: 5 views/ip/24h. Very similar to shorte.st. Same pros and cons. I think it's actually THE largest url shortener in the market, so they must be doing something right. I'd probably be using it as well if they had a different API.
7. linkbucks.com - Captcha:None. Counts: 5 views/ip/24h. I included this one for completeness. I haven't tried it because I haven't properly evaluated it's API. It's very well known and seems to have a large following. Maybe you like the looks, maybe you don't? It's worth a look anyway.
8. Vacant
9. Vacant
10. Vacant

And last but not least, those who count only unique views from your visitors. They usually have considerably higher CPM rates, but you only get one view counted from each visitor (per 24h). If you have a lot of unique visitors and they don't click repeatedly on your links, this is the choice for you.

Top 10 URL Shorteners That Count Only Unique Views

1. kuturl.com - Captcha: reCaptcha. I just love this one, some views might slip through your fingers but the CPM rate is off the chart. YOU NEED TO TRY THIS ONE!!!
2. coinlink.us - Captcha: reCaptcha. Almost as great CPM rate as kuturl.com and it seems to count slightly more views. You owe it to yourself to try this one out, it's just that good!
3. adbility.me - Captcha: SolveMedia. It's definitely in the "best of" category and very similar to cutwin.com in earnings. My personal gut feeling is that I like this one better due to the choice of captcha and the administration interface.
4. cutwin.com - Captcha: reCaptcha. Good balance of views counted and CPM rate, it's a solid earner.
5. l2s.io - Captcha: SolveMedia. Good choice of captcha, SolveMedia is usually easy on the visitor. Doesn't seem to count as many views as the others but CPM rate is good enough to make up for this.
6. cut-urls.com - Captcha: reCaptcha. Like l2s.io, it seems to count somewhat fewer views, but CPM rate is high enough to make up for this. I place it below l2s.io because of using reCaptcha instead of SolveMedia. Both have a good interface and a solid API.
7. btc.ms - Captcha: reCaptcha. Not as great as it has been in the past but still a fair earner. I would still include it in the list since rumor has it that btc.ms is due for a major overhaul and you want to be a user before this happens.
8. spaste.com - Captcha: SolveMedia. I really don't like the interface and there are statistics that I really miss. However, good choice of captcha and it seems to pay pretty well.
9. adpop.me - Captcha: reCaptcha. I have only just begun using this one myself, but it seems to have great potential.
10. short.am - Captcha: reCaptcha. It's just good enough to be included in the top 10 but it's hanging on a thread. Not a great interface, not great with statistics, doesn't count views like the best, doesn't have the highest CPM rate, but it doesn't completely suck either. Depending on your personal preferences and your traffic, it might be a good option for you? Use with caution, but give your traffic a good analysis first so that you know how to decide whether to keep it or discard it. It has good potential for the right application.

There you have it, three top 10 lists according to how they count traffic. I guarantee that using short links from (most of) these providers will earn you a good income if used correctly. Maximizing your income can be done by analyzing your traffic and picking the correct earnings model for your unique application.