The Vista oceanview rooms would be fine for us, actually (we did outside on the Triumph, and it was okay, although he was smaller then), but we were looking at one of their older ships, and the outside cabins are SMALL. I was also suspicious that it was a higher demand date for Carnival than it was for Disney. Inside to inside, or basic outside to basic outside, Disney was coming in at more, but at least for the dates we were looking at, the basic Disney cabins were less or comparable to cabins that we'd comfortably fit in on
RCCL or Carnival or Norwegian, and Disney's cabins seemed very well configured for us. I wouldn't be surprised if this is something that varies a lot, though.