According to 1up.com, Devil May Cry 4 on the PS3 will look and play better on the PS3 than the XBOX-360. News comes from this months gaming magazine in Japan called 'Famitsu' that the PS3 version of Devil May Cry 4 will feature exclusive content including: 5.1 LPCM audio, PSN support, and the option to install data to the hard drive. Apparently though, game data takes up 5GB of storage, but on the bright side of things, it removes all load times in the game.
Furthermore, Sony is poised to release a Devil May Cry 4 PS3 bundle in Japan for the die-hard button mashing fans. Just hope the price doesn't make you cry though.
I'll probably wait now until both are released to see exactly what more content gets rleased for the PS3 version and depending if it is worth it i'll prob just end up getting ti for the X360 for achievemetns.
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But as you said as well we are just going to have to wait and see 
Other thing is will Xbox have it as a free update or make you pay for it and the other problem is i hope they dont region restrict it like with the gears maps its all region restricted so i cant download them which sucks.Anyway thanks again for the feedback
oh how terrible it is to realize you rather play some games for the 360 achievements. Even worse when I know your feelings exactly 
extra's or not, I say a game like DMC should never be played without a rumble. And since that is available day one for the 360, plus with achievements, the choice is quite simple fellow gamer
But i have rumble for the PS3 But yeah i guess i'll get xross games for the 360 until PS3 gets its achievement system going i just find that you get more out of a game with achievements and reaching a goal in a game feels alot more worthy just my 2 cents
SoralinkGS
However, above all of that news, I also heard that type of talk about Assassin's Creed for PS3, and it ended up worse on the PS3. However, this is Capcom, so you never know. Either way, its a "wait and see" to see what version is truly superior (as you stated).