Like pkcable said the Note 7 isn't out yet (aside from demo units at best buys and carriers), so unless people here tested both Note 7s and their cases the people here will be limited in what they can tell you. What are you looking for in a case? Do you want something thick, and encompassing that protects/covers the entire phone? Do you want something thin that only covers the edges? Do you want something that covers buttons and ports, or something that leaves those areas open? Do you want any particular colors, shapes, or textures?
Even among the tech21 company you mentioned there are multiple models/versions of covers.