Bowhunter magazine did a test last year between scent blocker and scent loc and the scent blocker came out on top as far as their tests.
I just bought some this x-mas so i cant tell you if it works yet.

I like predator camo fall brown and spring green, also like advantage for the late fall after leaves go down and early spring. Mossy Oal all though it looks nice to wear i believe tends to "blob" to much. Everything I've read about camo and personal experience says you need alot of light tans etc in the pattern to break up your outline more effectivley.