If you look at the descriptions on both advanced performance and performance, they're not that different. Side bracing is the most noticeable distinction, and IMO that yields a subtle change at best. They were all redesigned by Andy, and in my experience, they don't sound anything like their Standard II counterparts. As I said, I am absolutely thrilled with my 2018 custom GA (sitka/hog). Since I'm quite familiar with the spruce/hog combination, having owned close to a dozen across different brands, I have to believe that the game changer here is the performance bracing. If I may, what is the wood combination you're considering?