From my point of view pVC is truly right.
I have Os4.0 and Mos2.0 (unregistred) and MorphOs is better in any points over Os4.0. (I don't know about Os4.1)
Many 68k programs/games don't work on Os4, and many which start fine, after some time freezes with GR and DSI error.
Many time after that only reset help.
On MOS,68k program will run and do work, or will simply crush whole system on start.
I make on both systems dir "68K" in which I put only STABLE 68k programs, and many times I must remove some programs on Os4 because DSI error pop on the screen after using some options. Mos 68k programs work perfectily or don't work at all.
I have also 9 classic amigas and I still prefer Os3.9 over Mos and Os4. I like amiga's paint/animation/music software but Mos and Os4 sadly don't have anything which I can use to create something.
My last Amiga hope is only Natami :bow: , because I sick of to many Amiga "compatibile" systems with limited software support.