Peanut butter every time, I've tried loads of products but nothing works like peanut butter. Must admit I haven't tried chocolate, too good for mice. The dead mice get released at the bottom of our garden, where they're promptly picked up by birds for a good meal thereby completing the circle...
Our cat brings in one or two mice a day, sometimes they get away under cupboards and such and can be hard to get hold of. Just buy a mouse trap, load it with peanut butter and place near where you see the mouse or its droppings. Give it up to 12 hours, job done every time. Quick, painless...