well, as you might know there's kinda "war" between intel and AMD. but amd is cheaper. and intel is a bit faster. it doesn't really matter. you won't notice in game and the only thing you could notice is that the I7-cores are slightly faster als the AMD ones.
AMD FX-9590 is the same as I5-cores. I7 could be slightly faster. but that 0.000001 second u won't notice. i got the 9590 amd's and i'm glad i have this one because it's fast.
Mike