I would stick with the hopper. They seem to fixate on that jerky movement and it intices them to strike. I like that my babies get all riled up at feeding time.

And don't worry about leaving the hopper in overnight. Once that smell of the mouse permeates the tub, and the mouse is in such close proximity to the snake, they generally can't stand it and strike/coil/eat. Like us at a buffet.. we really can't help ourselves, LOL.