64: Jungle Level.
While I would say that I prefer the Brawl remix, this one...OHHHHHHH MY GOD THE ATMOSPHERE. It really captures the essence of a gorilla whose bananas got stolen, minus the idea of a gorilla running around punching crocodiles and the fact that it sounds ridiculous.
Melee: Story 5 Meeting.
While I haven't played any Fire Emblem games that I have even a glimpse of a chance getting through without Google Translate, the music is top-notch. You can find me constantly humming this amazing track for hours on end sometimes. Oh my God...I...I need to play one of these games. (Should I start with the GBA one or the DS remake of Shadow Dragon?)
Brawl:
...
...
...um...
...I...uh...
...I can't choose between Mute City and Space Armada. On one hand, you have the best remix of Mute City known to man. On the other, you have an orchestrated piece rivaling the entire soundtrack of Super Mario Galaxy.
Smash 4: Gerudo Valley. Oh. My. God.
The acoustic guitars combined with electric ones make this music just amazing to listen to, that whistle at the middle is perfect, just...the whole thing...I'm foaming at the mouth.
Smash Ultimate:
...
...oh no...
...oh God...
...oh crap...
...another tie.
Divine Bloodlines, Snake Man, and Brinstar Depths, I'd argue, are better than even Gerudo Valley. I don't know what it is about the combination of violins and electric guitars is, but it just works...SO GOSH DANG WELL!