You won't get nearly as close to the glaciers on the Princess cruises. My friends for example only got to within 2 miles of Hubbard Glacier last week.
And the Kenai Fjords trip concentrates on marine wildlife - the glacier is only a small part of the experience.
Short answer - if you have the time, yes, the Kenai Fjords tour is still well worth it and different from the other two.
There is no comparison between a 1000+ passenger cruise ship and those used in the Kenai Fjords. It is an entirely different experience.
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