I think it's Vince because the buck stops with him. However, is Triple H the only guy running NXT? I give him props, but I doubt he's the only one running the company. Sasha seemed better as a heel, Bayley's character is corny to me, I never cared for The Ascension, and The Vaudevillains deserve to be ruined after they had to interrupt the potential of Stephanie twerking (IDC what anyone else says).
Speaking of which, from my understanding, I believe the Steph will be handed the keys, but I think Triple H will also have more control to an extent.