Ultimately, you have to get what system u think is best. My take on launch lineups:
Killer instinct just had some bad news come out (only 6 total characters at launch, no story mode). What's there tho seems like it will be solid.
Dead Rising 3 actually looks like it could be pretty sweet. The newest gameplay videos really changed my opinion of it.
Ryse looks poor to me. Since the first video, I predicted it will end up okay at best (but more likely crap).
Forza looks like they made another good game. Not a racing game fan, but no denying they put quality into their games.
inFAMOUS SS looks amazing (thank God since I2 was such a disappointment)
Killzone SF looks like it could be pretty sweet. MP will be great. Hoping campaign matches the multiplayer quality this time around.
Knack looks mediocre and underwhelming as of now. Think the gameplay may be really good, but the artstyle is poor.
Driveclub looking mediocre also at this point. Unless new videos show some great things not yet seen, think it'll remain that way.
Havent paid much attn to ps4s indie titles, but seems like there's a lot of hype around some of them.
Prior to the bad news about KI and the recent news that inFAMOUS SS will be a launch window title, I felt XBO's launch lineup was undeniably stronger than PS4s. Now, for my taste, ps4 is superior due to I:SS. Generally speaking, tho, I'd say they're now somewhat even.