I preferred the third one because their website was more usable -- all work was on one page and all I had to do was scroll down. Unlike the others where I had to click specific projects then view pictures 1, 2, 3, 4... real turn-off when I'm trying to easily compare all three together.

The third also looks like there has been a real effort and focus on usable websites without a disregard for looks which is essentially what I would be looking for.