Personally, I would go for HAL. When you book your cabin, make sure that it has a pull out sleeper couch. Otherwise, you may end up with one of you having to scramble in and out of an upper bunk bed. But, every HAL cabin we have had included the couch. Plus, they are very oriented toward enrichment rather than party hardy. Lectures, and demo's instead of buckets of beer.
But, any cruise is a good one and any Alaska cruise is heaven, in my book.