My LFS carries the kole tangs all the time and I love them and IMO are very beautiful, however, they just ordered in two Tomini tangs a couple of weeks ago and everytime I went in I would compare the two and tried to picture each one in my tank.
I ended up going for the Tomini because I love there coloring and their fins, very very cool looking fish and very active, shy at first but they come around. I also like that they are not as popular as the yellow or blue hippo tangs.
So my vote is for the Tomini! great fish!