What's a prettier beach: Rendezvous Cay or Water Caye

[Westbank is bestbank]

Trying to decide which excursion to book in Belize. Rendezvous Caye or Water Caye. I'm looking for the beach with the clearest water....

Carnival offers both.

[crewsweeper]

Both have iron shores surrounding them but both are in the same part of the Caribbean so they'll have similar clear water around them. Neither are near any flow of sea grass like some mainland beaches, nor are they near any rivers or where silt is an issue.