I prefer 2ct2, but you'll find it's pretty evenly split among those who try both with an open mind. The hype about 2ct7 being better is starting to fade a bit and people are realizing that 2ct2 is just as good or better these days.
I can't really put my finger on why i like 2ct2 better, I just experienced better trips with it. The two drugs aren't easy to tell apart.