One thing to keep in mind which makes Steem different than other crypto-currencys is the conversion to/from Steem Power. If you are looking to do short-term trading, then holding Steem is OK. If you plan to hold on long-term though, then your best best is to convert to Steem Power, since 90% of the new coins that are generated will get distributed back to SP holders.
SteemPower may seem like a good idea however let us take a look at someone who buys off of lows sell half on a doubles and then reinvest the profits back into steem coins and see who does better. My guess is the person selling half on a double will do better than a buy and holder even in steempower.
Since this is what I plan to do I will post my results here on steem from time to time.
I think that if you can beat the inflation with trading that would be really impressive. I'd rather have my steems locked up as steem power. Long term investment in a unique project.