I like four color on screens and in hand held card games, but not for any stud poker, including holdem. Any time you're peeking at hole cards, the lighting starts causing color problems for some people. Like that damn dress. Blue? White? Gold? Black?
If the four colors are bright and different enough to read as colors when peeking at holes, they look bad face up. Four colors that look good face up have peek problems. Doesn't happen with the classic colors, because we are forced to rely on the shape.