I find that all fish that don't have good looks will make up with it by either personality (like coming to see you all the time) or comical behavior(such as feeding so agressively as to make it almost impossible not to overfeed). It's really not a question that can be easily answered.
GD....what a pretty little green barb you have there ! I've always wanted a tank with a group of those....no room at present, but maybe someday when I get that 75+ tank !