AMD has actually had pretty stable drivers, there was a time when they had some bad ones, but Nvidia just had one a few months back too.
Dont base your decision off of that. Its all about preference, some have a brand they are loyal too and some don't.
OT, the Maxwell line is the best line out atm. If you got the cash, get it. If not, either of the previous line of cards from AMD and Nvidia are good.