I saw an earlier poster who commented on resort switches. I have to agree.
Having just done a split stay, I wouldn't make that choice again.
Even though I consider myself a veteran packer, I still did not enjoy having to pack and reorganize. I kept clothes in separate suitcases, but it was still time consuming even to re-pack toiletries, stuffed animals, etc.
DH and I agree we will be staying at one resort in the future. Works for us, at least for now.
So my vote was for the single long stay. Which is a great thing!