l'm very fond of the Sonic Rush Bomber Barbara mix by Narci
There's already the fact Rush is up there as my top 3 favorite Sonic games of all time and that Bomber Barbara is a damn underrated boss theme, but I'm also fond of this remix from the Street Fighter III: 3rd Strike vibes it gives me.
Pretty big fighting game fan over here. Might be because a lot of the instruments remind me of the ones in SFIII's soundtrack, specially
Remy's theme (at around 14 seconds in).
I also have a thing for loud, aggressive synths that this remix hits you in the face with right from the start. And that's the name of the game, "aggression", alongside the drums it has such an aggressive sound to it that I can't help but get goosebumps to.
And that's about all I can say about it given my illiteracy in all things music theory.
(Honorable mention to tsunderecat's Chaos Angel act 3 "Sonic Forces style" remix from Sonic Advance 3. It's a really underrated remix.)