I've stayed at both.
personally I absolutely hated Coronado springs.
the theming was beautiful but I've never had a worse experience at a Disney resort.
check in took an hour, KTTWC did not have tickets loaded onto it as it should have, 5 AK buses came and not one erpcot bus came for 1hr, not enough room on the bus even though we always went to the first bus stop, extremely rude CM's at both the pepper market and maya grill, our luggage was misplaced and when we called to find out where it was we were told it was our fault for not putting the yellow ME tags on even though we did and then "magically" they were found.
I would never stay there again.
AoA is "OKAY" in my opinion.
the theming as amazing and its like you've just walked into someo f your favorite Disney movies.
the attention to detail really makes it special.
I will say that I was not a fan of the food court. it had a slight "wet dog" smell, and it was extremely loud which I feel is a combination of having no carpet, people moving their chairs, and having real silverware and plastic dishes.
and the food options are not for people that have a simple taste like myself.
if you stay in a suite the buses are not too far of a walk but if you stay in the standard little mermaid rooms you can honestly walk around the hour glass lake, through the 50's section of pop century and to the buses there faster than walking to the front of AoA.
out of those two resorts I would definitely opt for AoA but if I may suggest something else I would recommend pop century or port Orleans riverside or French quarter.