What things do you find to be a big difference? I'm reading through the write ups about both and they seem pretty similar on paper.
And by the way- I love your quote "no wrong way to do Disney..." So true! Everyone does it a little different. We stayed off property our first two times, when our twins were little, and it was the best situation for us. This last trip was our first on property and it was AMAZING but that's because the kids were older.
ASMu is an older resort where they took existing rooms, put two together to create a suite. The suite itself is cut up funny (no bath in bedroom, both off living space), small bedroom and secondary sleeping surfaces are all right together - and all fold outs. The have not been renovated in a very long time. ASMu is the worse footprint of the values but the suites are at the front so that is good. If you have stayed at AoA you will see that the amenities at ASMu are even't in the same ballpark. The theme there is more miss than hit.
AOA suites are larger with better design, at least one secondary sleeping surface is bedding (murphy), much nicer bathrooms, table for 4 instead of 2 if using for the group, interior hallways and the resort itself is more a Value Plus with pools as nice as moderates minus the slide/hot tub. Food court is above and beyond, one of the better ones on property. Never shared busing. And it's newer.
Again, it depends on your group, will you have resort time, which layout of the suite works better etc.
From
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Go here and they do a comparison of the two suites
http://**************.net/2012/06/24/review-the-family-suites-disneys-art-animation-resort-p3/
And they offer photo tours of the suites at both.
http://**************.net/wp-content/uploads/2012/09/Family-Suite-Floor-Plan-Disneys-All-Star-Music-Resort-from-**************.net_-890x1024.jpg
http://**************.net/wp-content/uploads/2012/06/Family-Suite-Floor-Plan-Disneys-Art-of-Animation-Resort-from-**************.net_1.jpg