I had the oportunity to play both. I made my money on frerolls ( like many) and start playing ring games.
My bank roll grow up but time show me that i was not very good at the ring games for many reasons. Then i start playing sit and goes and did ok, but i did better when i move to torunamnets, cashing in some of them, but end up loosing again on the ring games.
I think that on line poker presnts a much better opportunity to make a quick buck on cash games but all in all i will focus more in doing tournamnets only for a while.
alex