I voted Crested and Leopard geckos, I keep both and love them both for different reasons.

Both are very different species, but both have alot of qualities. Both tolerate handling very well. It just depends on you and what you would like to keep. Would you rather have a desert dwelling animal that requires very low humidity? Or would you rather have a rainforest animal with lots of foliage? Remember leos eat only insects and cresties can eat fruit and insects. Both are fun and rewarding.