Mine is either the "Lazy Town - We Are Number One!" port by Wakana or the "SONIC.EXE - ..." port by HarvettFox96
And while it's not my favorite, I think the "Super Mario Kart - Rainbow Road" port by Ultima sounds better than the one from the original game. I think that song sounds better with SMW instruments.If you're questioning your gender or sexuality, if you need a place to vent, or if you simply need someone to talk to, feel free to PM me.
Pretty much all of the unsampled Donkey Kong Country ports are good.
I also really like Wakana's port of the Bowser Castle theme from Mario Kart DS, Ultima's Sandopolis Zone Act 1 port, Gamma V's Volcano Valley Act 1 port, both of WyattCroucher's Super Marisa Land overworld ports (marisaw3 and marisaw7), the Sammer Kingdom port, the Buoy Base port, Wakana's ports of Our Hisou Tensoku and Rumia's theme, and LadiesMan217's ports of the final boss and flower garden theme from Yoshi's Island (actually, pretty much all of his unsampled ports seem to be pretty good).
I'm not picking a specific one for this. I especially love songs that I heard in Let's Play/gameplay videos back when I was ~10 years old. Those will stick with me forever despite not being the best ports by a long shot.
Of recent times however, the Spider Dance rendition by Wakana last year was straight fire, about equal to what the original is. Not the best song in general but the way they remade it is awesome. Another honorable mention includes that remixed Overworld theme you hear during the first portion of 100 Rooms of Enemies. That one rocks and I kind of pretend to include the extra notes whenever I hear the original again.
If Nico Nico Douga counts, that completely oblirates the opposition. But of course it doesn't.
There are alot of good custom musics that i really like but if i had to choose two to call my favorites i'd say Super Meatboy - Hot Damned by Torchkas and Super Mario 64 - Bob-omb Battlefield by Pinci.
There are a lot of 1:1 ports and technically impressive custom songs out there but Asterix & Obelix - The Mountains ported by ggamer77 is my slam jam. I first heard it in Deeke's hack and literally listened to all 4000+ individual songs here for 3 hours one afternoon trying to find it, gave up, and he told me it was in a soundtrack submission... like the only file I didn't check. Mother 3 - Hard Rain is runner-up for favorite.
Just look above you... If it's something that can be stopped, then just try to stop it!
The underwater remix (track 17) from VLDC8 is probably my single favorite custom track. I love absolutely everything about it.
I was showing off this hack to my friends and family and everyone went nuts with excitement when the recurring Super Mario World melodies swelled up. It's a really beautiful track. My brother still says to me every now and then just how much he loves this piece of music.
This port of Final Fantasy VI - Phantom Train still remains my favorite port so far. There's a few other contenders, but this is the song port that made me want to make a level for VLDC12 before unfortunate events happened that forced me to skip out on participating.