I like the wider cabin deck corridors on the Voyager - with both the port and starboard cabins on the same "hall" - far friendlier. The Voyager cabins are bigger/better laid out. And there is no comparison between the bathrooms - the Voyager wins, hands down.
Having said all of the above, I had a wonderful trip on the Mariner earlier this year.
And I can't say enough about the crew/staff on both ships.
