Jake Thorn :
The b85 would be better for gaming, the only real big difference is that the z77 is not a board designed for overclocking.
UH! The Z77 is very well known for it's overclocking ability and strong gaming ability.
The B85 is the cheaper alternative to the Z87 running a 4th gen Intel CPU, However some B85's are pretty decent and are good at overclocking. It really just depends on the board.