They just would scare me cause of all the issues they had when they first launched. I know theyve got them all cleared up now and it would be extremely rare to run into them again but, still. The Z77's have been pretty much trouble free from what I can tell so Id have a little more peace of mind with them.
Best of all though, with the P67, you cant use the onboard GPU. Thats always a nice backup in case your GPU takes a crap on you. The IGPU can get you thru at least until you get a new video card in.