robert,
Inferno's question is a good one. How do you plan to use the car?
I have one of each and enjoy them both. Not sure about F355's comment on the clutch effort as both cars have the same LUK clutch and the same combination throw-out bearing / hydraulic slave cylinder. Clutch operation isn't very different in my two cars.
They both track well but the SRT had nasty bump steer that the GTS did not have.
I prefer the seats, the seating position and the gas/brake/clutch pedal arrangement of the SRT.
No doubt the SRT's suspension is softer, too soft in my opinion and not adjustable. Having said that, the first change I made to the ACR was to lighten the springs both front and rear.
The SRT has a weak differential, the GTS does not.
The GTS's shift linkage is smoother than the SRT.
If you plan to track or drag the car, the GTS, or better yet the new coupe, is the way to go. With the vert you'll need a roll bar and / or hard top or both, in addition to a new diff.
In stock configuration, the GTS was quieter than the SRT, but I think that's just side exhaust (SRT) vs rear exhaust (GTS).
The SRT is more refined and more modern, but I don't think that makes it that much more attractive. The GTS gets more attention on the road than the SRT.
Tough choice, they're both nice cars.
Pick one and enjoy.
Dan