I had a 2SS that I put about 6,000 miles on so I can at least share my experience.

Honestly, the performance side was lacking. Yeah it has 20" wheels and big brakes, they look good but add a ton of rotating weight to a car that is already overweight. It had horrid amounts of understeer which I find unacceptable in a RWD car. A few people said they had lessened it with different wheel/tire combinations and widening up the front tires but this should have been remedied before these cars were ever built. Straight line performance was alright but not impressive by any means. The LS3 is a great motor but when it's pushing close to 4,000 pounds, well you get the idea. I never had it at the track but it didn't seem any faster than my bolt on 4th gen.

All that stuff aside, it would make a great daily driver. The interior is great, the seats were comfortable, not too much road noise, and the radio in the 2SS was awesome.

It really depends on what you're looking for. From your original post I would say you're looking more for the best performance numbers you can get for the money spent. I haven't gotten a chance to drive the new 5.0 GT but on paper it looks like the better performer. As far as looks I think the Camaro wins but you can easily decide that for yourself.