There was a great thread from a guy who had both cams in his car at different times and he wrote a review on it.. If I find it I will post the link.

I think you'll be more limited by the XP cam just because the car has to get up into its powerband. You'll feel bogged down at first. I can't truly say, I have never driven an XP cammed car or been in one. Just based on what I have seen on videos and my experiences in my car.