Depends on the mechanics. Are there any safeguards to prevent me from teleporting somewhere dangerous? Does it take into account the motion of the planets and the expansion of the universe, or am I likely to end up in outer space the second I use it? When I slow down time, do I move at full speed and if so, does some kind of magic prevent me from injuring myself via air friction? For that matter, can I speed time back up again when I'm done? If slowing down time doesn't affect me personally, I'd take that one. Otherwise, I'll take teleport.
Fidget toys! Do you want one that makes a satisfying clicking sound, or one that is silent and doesn't annoy the people around you?
Fidget toys! Do you want one that makes a satisfying clicking sound, or one that is silent and doesn't annoy the people around you?