We did SWDAS in 2017 and MDAS in 2019 (just before the shutdown).
SWDAS features more guests in costumes. There were a lot of guests dressed up from midday to late evening. The theme is used in the dining room, where the servers are dressed in imperial costumes.
For the rest of the activities, they are pretty similar both in nature and quantity. We had a preference for the Marvel M&G since they involved more interactions and we prefer the IP. The roaming characters from SW were more fun. The takeover of the ship by the Empire made the overall feel more integrated. The MDAS deck show is better.
I would pick the route (5 days out of Miami for MDAS - 7 days out of PC for SWDAS) and your favourite IP instead of focusing on the specific activities. Those could change the next time they sail anyway.