Difference between Amiga and Atari 520?

[TjLaZer]

The Atari 520ST was Atari's answer to the Commodore's Amiga 1000.  They actually beat CBM to the punch by releasing it first!  Sold fairly well, especially in Europe.  The Atari 1040STf mostly competed with the Amiga 500 with 1MB for a few years until the Mega series continued to compete with the A2000.  Then the MegaSTE/TT030 competed with the A3000/4000!  I own all these machines btw  

[TjLaZer]

I would say the biggest difference is the OS.  AmigaDOS 3.x is like eons ahead of TOS 4.x, even with OS enhancements like MagiC and MiNT, etc.  But never the less, the Atari computers are fun to play around with.  I remember the great Atari vs Commodore wars, ah the memories!!!