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I have been on KFT and was very impressed. You can't go wrong with either but the deal is a deal. Go with the deal. Major Marine has slower boats so it takes a bit longer and some tours aren't offered (Northwestern Glacier and the Aialik with Fox Island). Both, I am told, have excellent narrators and you will not have to pay extra for lunch on KFT (although you won't be able to pig out as on Major Marine--but you shouldn't pig out while on the open seas).