...I like crocodilians the most for the fact that so few people keep them. (not including the fact that they require large space, many Herpers have splendid amounts of room.)
And the fact that they are most sophisticated in the reptilian world. But the main fact is that these are one of the last to be exploited for unnatural colorations. Very few morphs, in which I hope it stays this way. Can't stand seeing animals overpriced and bought only because they can make more money out of them. "Can't rack these puppies".. heh..
I currently keep about 18 or so crocodilians, haven't done a head count in several weeks.
My other favorites are the classics.. Turtles.