Speaking from experience, the fish tanks make tough and awkward cleaning/feeding.

We are working on a "name brand" frog enclosure right now. Have most of the supplies. But just from looking at it sit there, I can tell that it will be a lot easier to just pop open a door and sneak in some food for them. They certainly aren't cheap to set up, though. About the only con so far. (but it's for the friends!!)