The Z06! No doubt!
The C6 with the LS3 is already faster and handles better than the Camaro (not that the Camaro is bad at these things. It's just not as good as the 'Vette). Then, you add in the fact that it's a Z06 and I really think it's an easy decision.
If it's the warranty or color that bother you, the guy on this thread is trying to sell his yellow Z06 for 50k as well. 6k miles as opposed to 15k miles.
http://mustangforums.com/forum/2005-...-creative.html (yes I know it's a mustang forum. That doesn't change the fact that the guy is trying to sell his Z06. And no, I'm not trolling.) I think his is still under warranty since he only bought it a year or so ago.
Good luck with your decision - it's your car, after all. The camaro is a great car. But the corvette is supposed to be the best thing that GM makes. And the Z06 is a better version of that (used to be the best until the ZR1 came around). The Z06 should be hands down better in pretty much every aspect.