You know
as far as I can recall I have not had driver issues with my ATI cards.. (though one of them had it's 2D clocks too low for it's own good)
as far as I can recall I have not had driver issues with my nvidia cards.. (
http://poopr.org/images/hgwl7ap3wx4rm2t8tuj3.jpg lolz?)
Granted, I have not run SLI or Crossfire, but regardless of what you go with, sometimes CF is buggery or SLI is buggery.
I would suggest just buying what fits your budget and performs the way you want and in the manner you want.
*Edit
I would like to add that
both companies have had many scandals in the past and
will in the future, it is not a one-sided thing.