As happy user of Morphos and Amiga Os 4 I have to say:

Morphos is only little better than Amiga Os 4. Both os are very outdated.

Both main features are running on non-pc, integration with 68k software, mui.

There is no feature in Morphos worth resignation from Amiga Os 4.

Great advantage which Amiga Os 4 has over Morphos is it run in WinUAE.

Soft made for Amiga Os 4 will be able to run even when last mac stop working.