I think MSDOS was more stable than Workbench. But Workbench was more stable than Windows2000
Hmmmm... I cannot agree with you on that...
I have used pcs since spring 1999 and the most stable windows based os i have ever used (disregard any hardware specs causing instability) is windows 2000 (professional).
second place goes to XP. I only changed to Xp because drivers were no longer written to support win2k.
and third place goes to win98se...
Judging by my experiences with PCs over the years...
And by my experiences workbench do not come even close to win2k.
But amiga os beats the crap out of win95, early 98 releases and win millennium with regards to stability.
It does not beat win 3.11 in stability, but sure as hell beats it in userfriendliness and of course, multitasking....

With regards to msdos. i have very little experiences with it.