I was going to say, the big difference is whether something is released or not, but neither are fully released...so maybe its not such a big difference after all.
MorphOS basically requires a purchase of a peg board, you cannot download it or get it separately...and buying a peg board is a huge problem, as there are no regular channels to buy one. Pay in advance type of thing.
AmigaOS is not publicly available at all.
still a sad situation.