Original only for me.
Just the other day I got my CRT set up, Genesis plugged in, and stacked Sonic 2 onto Sonic and Knuckles in that goofy early "expansion " setup...
The controller feel, sound, and graphics all have to come together to get that full nostalgic feel imo, even if it's a pain in the ass.
Killer soundtrack that only fits with a 90's tube TV.
Same goes for NES, SNES, N64...
Also, yes... I'm a collector at heart. I'll save up for the original in patience if that's what it takes.