I'd also say DHS and MK, simply because DHS does have more rides than AK.
If they have a free timeshare, the week is probably locked in so they have no flexibility with dates. I would really be encouraging them to skip Disney, and theme parks in general. It seems like they're not really committed to Disney and they're going to go and hate the crowds. They'll likely get their 3 FP+ selections (and pickings will be slim) and then they'll be waiting in hour+ lines for everything else, because I can imagine that they won't want to RD, which will be essential that time of year. So if they get 2 day tickets, they're going to be spending $800 to ride 6 rides with short waits in two days, and then stand in line the rest of the time. This trip sounds like a recipe for disaster.