You all do know there is a such thing as the RS/SS??? The RS is just an appearance package. Smoked wheels, smoked tails, RED RS badge(if it's a v6) or RED SS badge(if it's an SS). The v6 package is called the LT, and there's an LT1 and LT2(just more options than the LT1, no difference in power). Same as the SS, SS1 and SS2. And the RS package can be added to all except the LT1 package.
The easiest and quickest way to tell an SS, is the scoop on the front fascia in front of the hood. I know it can be changed out, but not many people are gonna buy a brand new $25k plus car and swap out the front fascia.
I can't say anything about how fast they are, cuz I have yet to see one run. But all mags and forums I've seen, the v6 is a close race for a stock RT, some even coming down to driver error. The SS has always been ahead of the SRT in everything I've read, with the exception of driver error. And yes, the clutch is really tricky on the Camaro so I've heard.