I have stayed away from all of them except moonsteem (mostly as an investor there) and I haven't regretted it yet. In my view, the only way to be sure to beat them is to run them and not play or mine for coins. The way I see it, it's all just a gimmick for people to keep playing with an overall negative expectation. So it's mostly down to luck, nice to see you are in the green still Peter!

Good Luck (You'll need it :-) )