Unlike NSMB2, I didn't feel immense buyer's remorse. It's significant because reviews had me practically convinced that I would not like this game, but I think pretty highly of it. As for replay value, like the other PM games there is nothing to really make you want to pick it back up for a while after finishing the main quest.
Because I don't feel the need to return this game, I think either format is a sound investment. --- An infant sea turtle is actually capable of killing an adult African bull elephant. It does, however, require a substantial amount of surprise.