I guess I'm a little partial, but I'd say veileds are pretty friendly if started off that way. I made the mistake of not really handeling mine at all for the first few months that I had them (I got them very young, about 1 month old) so now they are both a little skittish. I'm working on it tho, mainly b/c they have outgrown the cage I have for them, and the female needs to get away from the male sometimes, so I take one or the other out & try to handle them.
I've heard of some pretty aggressive panthers, but it has been mainly WC animals, so if you go with a CB juvie or well-handled adult, either should be fine. Panthers do have a nice assortment of colors... they may be my next cham purchase many moons from now... Good Luck!
~C