I pick this exactly the way we pick other WDW vacations: based on what we want to do with those couple of pre-cruise days.
One time, we were just doing a resort stay and did AKL. It's a fun resort to just hang out and explore, and we normally don't stay there because we don't like bus-only transportation to parks, which doesn't matter on a resort day.
Another time, we had plans to do the Christmas party at MK, so we chose an MK area resort. Specifically Poly. It was really lovely, and drinking Lapu Lapus and having breakfast at "O'hana" before the ride to port really got us in the vacation mindset. That one was probably my favorite.
Another time, we were cruising just after Galaxy Edge was open, so chose Beach Club to be nearby. Unfortunately it ended up being an unusually cold November day (50 degrees) so stormalong bay was out! Something to keep in mind based on the time of year of your cruise that swimming might not always be a possibility.