As other have said on other threads, the answer to this will depend on whether you like the looks of the gen3/4 over the looks of the gts. Personally and assuming interior, frame stiffness, gearing, power, weight and performance is the same I'd prefer the volado design or even something better, wider and more agressive looking like a street serpent based from the volado design.
Having said that I think SRT did an amazing job with the gen5. Regardless of what us gen3/4 guys have to say the gts is currently the most popular viper design among viper fans and we better have great respect towards it as without the gts the gen3/4 would have never existed and the volado design which is inspired on those viper generations would have never been created.
I believe the reason why the gts design is so popular right now is because the generation that can currently afford the gen5 probably grow dreaming on having a gts. May be 10 years from now guys that grow dreaming of owning a gen3/4 will demand a design based on those generations. And I think that if SRT does a very improved version of the gen4 when creating a gen6 they would hit a home run.
I'll conclude by saying that I really like the new car.