SNG's for now, as they are the best return for my money. My current bank roll doesn't allow me to play ring games above $5, and most of them are very loose, much like the micros of which I'm not a big fan of. But as soon as I get over $1000, I plan on playing in some $10/$20 ring games and above just see if they are any better. If not, I'll stay with SNG's. I'm currently playing the freerolls
in order to get practice and experience at MTT's, as I'd like to play in some satellites to larger tournaments in the future.