Of the 3, we've only stayed at Caribbean Beach (3 times). We live in New Orleans, so as good as the POR theming is, it probably wouldn't excite us
, and I don't think we've even visited Coronado Springs.
However, I'd recommend Caribbean Beach, at the very least for its food court; it has the best resort food options we've seen, and that includes a bunch of the higher end ones. Plus, it's got the beaches, the play area on the island, and the Pirate adventure that DS found out about last time we were there
And it's got that whole 'Changes in Latitudes, Changes in Attitudes' thing going on, INCLUDING Buffett mixed into the background music.
But if you've stayed there before, you know about all this, so I don't know why I'm telling you this without being able to compare CBR to anything but the All Star Movies.
Have a great trip!