I've read through the threads and both apps look fantastic, but I'm wondering which you would choose, if you could only choose one?

Without giving away secrets, as I want to buy the right one, but please tell me the pros and cons that you've found.

Also, is it possible to list what reveal/trick each comes with and what are in-app purchses? I couldn't determine what the "basic" trick did and what the in-app purchases added.

Any help would be great and thanks for all your comments in advance.

Inject, no question. With it the spectator has a free choice to think of WHATEVER he wants, something which he can't do with Mental Killer.