I play pretty much everything on Carbon. Probably not the best idea for focusing on profits, but meh!
If I'm really bored, but I want to play, I join some sng HU games. That way I get action every hand
I can play cash games, turbos, hyper turbos, 6 max, full ring, STTs, MTTs, DoN, etc. I play em all. I'm not about that grinder life! I have to mix it up or I'd probably quit poker.
I think the worst for my bankroll though are those turbo +Rebuy +Addon tournaments. At the micro levels, everyone is shoving and YOLOing/Bingo it up hoping that they double up in the beginning stage. Suckouts are going to happen more than you want them too...
I'm starting to go off subject LOL, but yeah I agree focusing on a certain type of SnG would be profitable for you. Avoid them turbo +rebuy +addons IMO. If you bink a tournament you get paid, but I bust out so much or min cash that I feel like I'm just burning money.