Dart frogs need little to no ventilation, so if you get a glass top you won't have to fight humidity. They are diurnal. They hop around and explore all day and they're very pretty. I'd get dart frogs.

My crested geckos are a blast to walk in on when they're playing in the dark... then they freeze and don't move until the lights are off like the rest of the time. Definitely not a great display animal.