Not sure what to think of this. The video is 3 years old, i don’t know how good Picodrive is now but there is no chance in hell it was better than GX 3 years ago (as a Genesis emulator in general, not this particular test rom).
I also remember reading articles in reddit about these test roms and how some authors would fine tune their emulator to specifically run that as good as possible with them, without actually improving it’s compatibility/accuracy with all other games.
I rate the performance/quality of an emulator by it’s real world usage. That’s all the games it can run as good as possible. And GX was always better than Picodrive. Also, Blastem couldn’t run Virtua Racing (not sure about nowadays though).
Anyway, the only thing i care about in Picodrive is it’s accuracy/compatibility with 32X games since that’s the only way to play them in RetroArch. For Genesis/MegaDrive GX has me covered.