Just leaving my two cents, although being a junior I'm sure I only sounds bias to most.
60fps after experiencing it on a very nice 55" Samsung LED TV, seems very cartoony and not really life like. It was like when BluRay first came out and the image seemed to look like very bad green light effect where the characters did look like they belong in the screen. Very hard to explain but it almost felt like a B rated movie, that's how 60fps feels to me.
Need for Speed Rivals was the first next (current) gen racer I played and loved it the animations felt smooth and had no input faults whats so ever. Fastward to me getting an Xbox One just for Forza I felt that cartoony feel again of what 60fps looks like. Not sure about you guys but real life doesn't look like 60fps and to be honest doesn't do anything for me for racing games.
All that being said DriveClub with it's fantastic lighting seems to be very well placed rather than going for 60fps. They said they'd add weather such as rain and such if the community wanted it post release. So I'm sure they looked into it and since the game ran way above 30 when unlocked I'm sure weather will not affect the 30fps.
For me Project Cars so far does have the best Car Models outside, but DC have better interior. So depending on your play style I will give both equal points for that. But environment goes to DC because their lighting makes every feel so close to real life.
http://youtu.be/u9_GmRaDFU0?t=1m56s
They should rerelease this video with all the improvements because this is what got me back on the Driveclub Hype Train...that cozy feel inside that R8 cockpit at night...sweet baby jesus the feels.
Anyway I'm excited for both PCars and DC they bring different tastes of sweet baby jesus which is a very appetizing meal until GT7 gets here.