The buses from POP or AK take about 17 mins to get to MK, once your on the bus. Both of these resorts only have one bus stop, what I'd be worried about at SSR or OKW is they have multiple bus stops within the resort, so once you get on the bus at either of those it may take an additional 10 mins just to get out of the resort even though once you leave the resort travel time is probally about the same at POP or AK. Of course things may change in the future when the other section of POP opens and the
DVC gets added at AK, then they will both have multiple bus stops as well.