Well, I'd have to say either one won't be content in a 10 gallon tank. Any chameleon should be housed in an enclosure that is well ventilated and has good air circulation and much larger than a 10 gallon. As far as the beardie, a 10 gallon will work for maybe 2-3 months if you get a hatchling. After that, they definitely need a larger size. I hatched a beardie about a month ago. When he was born he was maybe 2 inches long, he's already around 5". I hope this helps. I'm not really sure of what species will be happily housed in that sized tank besides a lizard that stays very tiny.