My personal opinion is that you will have more time as an instructor.
On a secondary note...I don't know which degree you are trying for, but check out Old Dominion. They have a program that they worked out with the Navy that once officers finish Nuke school they will be 7 CD-ROM courses away from a Master in

(I think it was Nuclear Management...can't remember). The degree is accredited and it was designed this way so that even Sub officers could finish it without having access to the internet.