No, they're not.. Microsoft payed 50 million dollars or something like that to be the only console with downloadable content.. or exclusive downloadable content.. PS3 may have some, but it'll probably be stuff that's on 360..
The DVD thing isn't the problem with the 360.. DVD is probably better for the game since DVD has faster read times than Blu-Ray..
The problems are on both systems, though. PS3 because the game IS programmed for 360 and they are having trouble getting it to work on PS3 because that's the secondary console now like Xbox used to be. Framerates for all games are shitty on PS3 because it's so hard to program for.
The problem with 360 is that they can't guarantee that everybody has a hardddrive, so, it's screwing framerates in that sense because reading from a harddrive is much faster than a blu-ray or dvd. PS3 will have that advantage, however they'll probably make the game be Harddrive only on 360, which means if you don't have a harddrive on your 360, which you are an idiot not to, you won't be able to play it on PS3.
From what I've read though, the PS3 is probably the main part of the problem, but 360 is having it's troubles, too.. And the game just wasn't coming along as fast as they wanted.. And I think it'll be coming out after March, as well. Right now the release date is spring.. Which I think is March-May, or something like that.