Both are fun, if you want an easy to keep frog species, Id recommend whites tree frogs. Their long lived and hardy. As for turtles, I wouldent recommend aquatic ones as they require large cages and lots of filtrations. You cant go wrong with a russian tortose though, execept that it will probably live longer than you will. Regardless of what you get, RESEARCH IT FIRST, then buy it.
"In the embrace of Great Nurgle, I am no longer afraid, for with his pestilential favor I have become that which I once most feared, Death."