Presonus would get my vote.
They are both excellent companies. Im just a big fan of presonus. Great quality stuff, and great customer support
I think you'll find most suggestions based around the same sort of argument, when it comes down to it, both units are more or less the same quality, and its who you prefer to deal with. Guitarists in my band have an M-Audio Fastrack and an M-Audio Fasttrack Pro, and they have never had any issues with them. I use a Presonus Firepod and Eureka, but also have an M-Audio Tampa.
Both options are good
