We've never used our points, but we've sailed 4 times to Alaska on HAL. This May will be #5. HAL's ships may be smaller than some of the others sailing this area, but the cabins are larger than on the other ships. Disney does have larger cabins, but they don't sail to Alaska.
The Oosterdam is the newest of HAL's ships sailing Alaska, but the cabins are smaller and many HAL fans don't care for the design of the 'Vista' class ships.
We prefer the Vancouver cruises for better scenery, but air is more expensive to Vancouver. Many fly into Seattle a few days early and drive/shuttle/train to Vancouver.