This is my 2-cent:
Cash is all about patience, while MTTs are all about races
If you're good with cash, play MTTs for fun till you get a good grip over it (that's what I'm doing). I'm more of a cash game player and honestly, I haven't made any deep runs in MTTs yet (I might have played over 200 MTTs by now). One thing I've noticed is that in MTTs, people generally play more loose than in cash.
I'm trying freerolls
for now (there are tonnes of freerolls, and CC has like 5 in a week in PS); will start with SnG in a few day and take it from there.