I finally had the chance to test Wii-Mednafen and it's actually a very good emulator, despite the limited interface. PCE emulation is years beyond what we got before, but honestly, I am a huge Genesis fan and I cannot let say Mednafen is an improvement compared to Genesis Plus GX, it's actually the opposite for me :-)
Games with major graphical glitches: Aladdin, Out Runners, Double Clutch
Games not working or freezing: James Pond 3, Dracula, Fatal Rewind, Virtua Racing, a few unlicensed games
Off course, that's not much but there might be others, whereas I more or less tested the whole Genesis romset with Genesis Plus GX to get a full set of screenshots, and never encountered a single glitch or non-working game !
Sound emulation is good but not as accurate as Genesis Plus GX. Actually, it's sounds more like Gens while Genesis Plus GX is closer to Kega in term of accuracy. That's said, some people always prefered the sound of Gens even if it's not correct. Examples of a few games that notably sound wrong in Mednafen exactly like in Gens are Scoobi-Doo, Flashback (BGM 3 in sound test) or Comix Zone (many BGM in sound test) or have wrong sound effects (Alisia Dragoon, Beavis & Butthead, etc).
Some ROMS run for me with graphical glitches in Genesis Plus GX - ie. Sonic 2 has a flashing vertical bar on the left edge of the screen. I haven't noticed these problems in WiiMednafen.
This colored vertical bar is actually part of horizontal borders, which exist on real genesis as well, though most emulators don't bother rendering it so most people forgot it was even there. It can be disable in the video settings I think. I use a 4:3 CRT myself so it's barely visible.
The colours also look more like they should in WiiMednafen - after fiddling with the settings I could never get them quite as bright in GX.
I barely noticed any difference personally, Mednafen might be a little brighter though but it's not correct: I have my Wii and my Genesis running on the same TV on different inputs, and I can confirm Genesis Plus GX palette is a better match.
But to be totally honest, it's probably just my personal preference. They are both very good emulators.
Yeah, I agree this is always a matter of preference and I can undertsand people preferring to have all emulators in one too. That's said, I base my experience on facts and testing, not general impression which I think can be pretty much biased, and I am convinced Genesis Plus GX is a better Genesis emulator overall.
Edited by philyso, Sun Feb 12, 2012 2:33 PM.