Getting solid numbers on how many people are playing a given downloadable game based on platform can be tricky. Sure, you can look at the number of people on the leaderboards, but that doesn't count the innumerable people that play offline.
Thankfully EA's novel promotion for "Battlefield 1943," which will unlock the Coral Sea map on a given platform once that platform hits 43 million global kills in the game, is giving us some interesting new insight.
Right now the global kill count sits at 29.5 million kills on the 360 and 16.1 million kills on the PS3, meaning there are nearly double the number of 360 players as there are PS3 players. That's making the assumption that 360 players aren't just a lot better at the game.
At this rate we could very easily see the new map unlocking on the 360 in the next couple days, whereas the PS3 shouldn't be much farther behind. Hopefully by then all of the server woes (which persisted through the weekend) will be worked out.