Under the current climate (politically correct turn-of-phrase :lol: ) I'd go for the
SAM440 over Efika.
Why? Well quite honestly either way the court battle goes SAM still has a chance of getting OS4, Efika only stands a chance if Hyperion win.
Morph OS will be available for both at some point (so the sages tell us).
AROS is in much the same situation on both machines, ie. running on top of Linux and nativly at ....some point.
So there you go, I hope I was helpfull.
By the way, no criticism of the AROS team intended in the above "...some point" comment. The fact is they have done great things but still have lots to do. :-D