In my opinion the Cayman S is much more fun to drive, if only in the sense that it's a different feeling. The front end feels light, and "chuckable" if you know what i mean The 335i, their's no doubt it's an amazing car, but in the end it's a fast 3 series, not a mid engined sports car. It's a (really) nice luxury sedan/coupe!

Not to mention, 0-60 and 0-100 times really dont mean a whole lot to me, I'd say it depends on how much fun it is getting there! And the Cayman S, I can say from experience, is VERY fun!