A couple threads of the Pride at least this season make me think NCL would be worth the extra...
This year Carnival seems to have cut to the bone to try to be profitable, well they're still not profitable and people are having horrible experiences in Europe on Pride. Standing for hours in a hot shed waiting for embarkation, no hot water to take a shower, hours-long waits for a tender boat at tender ports, rusty holes in the deck by the pool, crew grabbing children, more and more.
Maybe next year will be better.