That’s a very subjective question since both cars are different with different acoustics. Also what I hear will be different to what you hear - it’s an age thing....
If your buying a brand new car, then the question should be is Bose better than stock? Yes.
Is Bose better than B&O in the A7, with B&O a £6k option I hope not.
I found bass lacking in my S7 (I have Bose) and added an external bass box with built in amp. Now l can feel as well as hear the music