In Theory, the Skyhook option should be an upgrade and for what it's worth, I do believe it will be the way to go. However, I just don't have enough experience with both to say for sure on the GT-S.
I can tell you that it's a worthwhile upgrade on the 4200, GranSport and QP models. Actually, I really believe it makes a huge difference on these cars. The main difference is that the suspension will be kept soft when you need it to be and will be stiff when it needs to be. With that said I don't believe that the setting are correct and thus, we're working for a fix to this which should be released soon.
There should be no reason that adaptive suspension dampening would be a bad thing. So long as it's designed correctly. The problem with the 4200 and Gransport was that the springs were not designed properly for the car. Once you load in the right set, the car performs very well without being too harsh. Being that this is a new Gen of car, it should be better.
I'll update this thread once I have more experience to say whether or not my thinking is consistant with what we've observed.
Best Regards