Alaska Cruise Glacier Differences

College Fjord - near Prince William Sound, can be done from Anchorage

Glacier Bay - Classic must see, but similar to College Fjord

Hubbard Glacier - huge ass glacier, bigger than glacier bay, but can't get as close
Tracy Arm Fjord, aka Sawyer - Fjord, near Juneau

Glacier Bay and College Fjords are similar

Pro tip:
Norwegian does Glacier Bay and Hubbard on the northbound itinerary only, and Princess only do both on the southbound itineraries.

https://www.tripadvisor.com/ShowTopic-g28923-i349-k8923134-Inside_Passage_vs_Glacier_Bay-Alaska.html