Welcome, in short the SS is a (more) modern version of the GXP. Much nicer interior, etc. Lots of electronic goodies, some more useful than others. You may want to know that the MyLink head unit is a 2013 era design and cannot support Apple CarPlay, Android Auto. No proven options for aftermarket support either, if that capability is important to you. I highlight this because of what you said you like about the Honda.
I came from the G8GT to a manual ‘16 SS, primarily for the transmission choice. It is a great car, a “better” driver than the G8, though I would love to still have that car as it had its own “presence” that I don’t think the SS quite has.
Anyway, search is your friend, there are a lot of threads that start out just like yours that will help answer your questions.
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