Wii is the last console capable of outputting real 240p on-spec (PS3 and X360 can't do it, Xbox 1 couldn't pull it as well), hence, with proper fiddling on most emulators you get 240p scanlines out of it on a retro TV with the cables it accepts; Composite, S-Video, RGB or component, your pick.
It looks glorious. If someone wants to I can take a few pictures. Playing Mega Drive/Genesis on it is honestly better than the original console (taking the controller aside, but that can be solved), because it has a setting to fake composite transparencies... blending out the dithering, as
illustrated here - accurately illustrated on the sonic comparison one, it cleanly delivers the end result, note that if that was composite
colors would suck, the emulator though does the blending whilst keeping the RGB output, which was the thing RF and Composhite on Genesis/Mega Drive didn't.
There's some degradation of horizontal detail on a full frame basis with it applied (as shown), but it positively saves games that relied on it from looking like checkerboard demo's with RGB cables... or looking like vomit over shitty cables. Getting transparencies over a quality output and scanlines feels like the best thing ever.
SNES I still prefer on the original console, due to the fact that no emulator can get to be that good with some games out there, but it's certainly sometimes more convenient to set up still.
Wii is my retro roadwarrior machine for that.