Written like someone who hasn't used these much and doesn't care. Best to do your own research, depending on the game you're after. Recommending just "MAME" (with no frontend or other tips) for arcade machines, for instance, is massively unhelpful (and saying it lacks features is massively wrong).
Don't trust this list, don't use it, don't link to it, would be my advice.
Playing devils advocate, the author does list the most prominent/active emulators for each system and even manages to generally characterize the difference between Snes9x and ZSNES. That being said, the list doesn't meet it own criteria, even with "best" being defined in a loose, consumer sense.
While I'm here, I highly recommend Robert Broglia's, http://www.explusalpha.com/ , emulators for Android and iOS. They can be pricey, but almost all of them are GPL and Robert cites his sources. The exception is Snes9x EX(+), which is free and under a noncommercial license.
Indeed, the mere fact that ZSNES is on this list makes it basically worthless. While it had its benefits a while ago (when people were running 500Mhz machines with 128MB RAM), there is no reason to use it to day, except for the fact that a few fan translations and romhacks require some of its bugs and inaccuracies.
If you don't want your CPU to be at 90% when playing a game from 1992 (this is bsnes/higan, the requirements are this high because it strives for 100% accurate emulation) use Snes9x, for which byuu (author of bsnes/higan) has ported many of his discoveries and improvements.
Don't trust this list, don't use it, don't link to it, would be my advice.