Let me just preface my comments by stating that I have not heard the Bravo, and my PA2V2 has yet to arrive. As a Beyer user (DT 880), I have spent a fair number of months trying to read up on the relative pros and cons of using tube amps instead of SS.
I'm also a gamer, so my 880 sees regular use with games, music, and the occasional movie.
Based on what I've read, tube amps sound pleasant due to "even order harmonic distortion". I have no clue what that means from first-hand experience, and I can't define it, but I have also heard it said that such harmonic distortion isn't so great for games. This seems to make sense: positional audio is key (even in a single player game), and any distortion may mess that kind of stuff up. I also think that explosions will sound odd through tubes, and uh...that's not what I'd want in a game. For that reason, I intend to continue going SS with my DT 880, at least as far as games are concerned.