It depends if you are looking for a
Disney cruise with Alaska included, or an Alaska-only cruise.
Either answer is correct.
Personally, I'd go with Holland America or Princess - they've been "doing" Alaska longer than the others and hold most of the permits for Glacier Bay.
If I were limited to a choice between
DCL or NCL, with NCL doing Glacier Bay and DCL not, I'd probably go with NCL. Even though I love DCL.