X1000 benchmarks

[krashan]

1. OS4 and MorphOS have a JIT for 68k software, whereas AROS doesn't yet.
2. OS4 and MorphOS don't have to swap the byte order of 68k code, whereas AROS does (not including AROS PPC and AROS 68k).

You've forgot about:
3. OS4 and MorphOS emulation allows 68k applications to use native system components and vice versa.

[krashan]

Tell me, are there any 68k libraries in regular use on OS4 or MorphOS that don't have native equivalents?

As a programmer of DigiBooster 3 I often deal with music modules packed with XPK SQSH or SMPL compressor. There are no MorphOS native (or AmigaOS 4 native AFAIK) versions of them. M68k versions work without any problems.

Another example is ARexx. AmigaOS 4 uses (and MorphOS can use) M68k interpreter.

In fact the opposite possibility is much more interesting. Legacy M68k apps can use native PowerPC libraries, which make them faster and enhance functionality. For example M68k apps use native ASL requesters, which are much more powerful and comfortable compared to AmigaOS 3.x ones.