I'm a 200 APM High-Master Zerg player (I play vs low Grand Masters occasionally to give you an MMR idea). Screwed around with a few switch types, and I'm really quite fond of Browns. I got myself an oldschool Cheery NKRO Brown keyboard and haven't looked back. It is much easier to play for long periods of time then with my Black board, and I enjoy it more then my buddy who has Clears (although he seems to like clears more). Blues are comparable, but I do quite a bit of streaming and/or Skype, and the noise is just too much.
Obviously, preference will always win out over popularity or opinion, but if you have no idea what switch you might enjoy (coming from a rubber dome keybord etc) I'd say Browns. Often times you will spam between keys rapidly, and Brown just seems to favor that the most out of the switch types I have tried.
I should also mention that I type ~130wpm and Browns are almost as nice as Blues for just general typing: which is also a plus. I can't stand typing for long periods of time on my Blacks keyboard: which has been strictly relegated to 3d shooters only now.