Spoken

The Rubinius Sprint: Except for, nobody including me is smart enough to predict which of the Ruby.next implementations is going to have that performance mojo. So, it seems like the only reasonable thing is to bet on all of ’em. One thing that makes this easy is that all the teams get along with each other; a natural outgrowth of Ruby culture, and something from which we can all learn. [Nice, with an interesting sidebar on a great community.]
Source: Tim Bray