The Sharp X68000 would outdo both the Atari ST and Amiga in this comparison.

It basically had arcade machine class video hardware. It came later to market, but creamed the Amiga completely in specs, and they ended up shipping 25 different models of them, up to really high clock rates.

Unfortunately only really sold in Japan (though due to population size of Japan, it actually sold a _lot_ of units and a lot of games were ported to it).

It's really too bad it never really made it to Europe and North America