@dunalduck honestly its a bit of a toss up between YC or BW both are about the same walk. Back in 2021 there was a lot of concern about it using the Disney buses, I found a bit of info you can read
here. It's from Disney itself and makes it clear that Disney buses are for all, not just resort guests. Over the years since this started I've never ready about any S/D guests being turned away or harassed. There were some issues at YC/BC with Epcot guests flooding the resort and jumping on the buses, either exiting or using the International Gateway to save walking through Epcot, but no stories I'ven seen about S/D guests.
I think using YC/BC makes more sense if you wanting to rope drop, but if you're going a bit later and taking it easy the S/D buses should work just great. The only other place I might use Disney is for going to Downtown Disney.