@minter Perc is also faster at pushing performance patches (some Facebook patches are in their latest RC release)
@minter Performance mostly and some usability patches. The link I sent sums up the latest cool things. I highly recommend Perc generally.
@minter Until 5.5, Percona. Even after they have some neat patches (which they may add to their own release of 5.5)
Wow, Percona’s new 5.1 release looks really really exciting! http://tinyurl.com/2by33ax