Excellsior definitely longer than the galaxy
Want the smoking gun? Check out the big ass Fed vs. dominion battle in DS9. Haven't watched those episodes in a while and this awesome thread had me nostalgic for the last televised Trek I actually liked (in DS9's case loved)
Nearly every shot in which an Ex is alongside a galaxy it is longer
For what it's worth I'd go with the biggest upscaled size and the larger upscaled size of the Connie and Refit as well.
I know the docking rings tend to poopoo the much larger upscaled size of the refit but they pooched the size of the docking rings on the Enterprise C as well
Damn I wish I had Cgi skills, love to render a refit with smaller docking rings to see how she would look
I love this thread