I stand corrected on the Emumiga front. However I think it does make a difference to the end users as converting to ppc code and using the system api gives a) much more integration b) is much much much faster
I think both solutions have their advantages & disadvantages. In my experience, the greatest disadvantage of the MorphOS/Trance approach is that many old Amiga applications simply aren't "system friendly enough" to work properly/work at all.
But we're getting quite off topic...