As much as a liked the rendition of Fillmore (Genesis version) I went back and started listening to them carefully and the SNES version is so much superior in just about every way and Actraiser is practically a launch title
Listen in particular to the variety of instruments present in the SNES version and how you can picture an orchestra playing real instruments that match, whereas I can't match any for the Genesis since they sound electronic mostly.
Listen with headphones and pay attention in particular to the low pitch horn that plays in the background. The author of the Genesis version tried to replicate that and it just sounds like he's hitting notes on a keyboard, whereas the SNES version sounds like an actual horn being playing by someone in an orchestra.
On the SNES version I can clearly hear a bass guitar's strings being pulled and slapped SLAPPA DA BASS! and one thing that always irked me about the Genesis sound is the inability to replicate the snare drum, sounds like a blown speaker, no seriously, the crackling of a BLOWN speaker is what snares sound like on the Genesis, take a listen.
My take away from all of this is that the SNES can replicate any sound the Genesis can, albeit at a lower sample, some instruments may sound cleaner on Genesis, but the problem is, game sound is not just music,
ambient sounds and voices are also part of video game sound.
Here's a great example, this is how Donkey Kong Country whooshing sounds of wind and rain will sound like on the Genesis, but then listen to the SNES version and you'll quickly understand why the Genesis will never be able to match the sounds the SNES can muster.