Taylormade all the way. I say this because I live in a Titleist community that seems to Titleist is the only manufacturer of golf gear. It makes me sick.
I think it really depends on the club you need to replace. In other words, I would stick with TaylorMade drivers. TaylorMade's drivers seem to consistently produce more yardage and Titleist drivers can be just a little un-forgiving. Now, on the iron side, I prefer Titleist. Titleist irons are more accurate and have better trajectory.
Ball wise, it's a coin toss. TaylorMade has come a long way with their ball development. But the most important fact is Titleist will always be the number #1 ball on tour.