It depends on pier assignment. Which dock you have, time of arrival, sea conditions, size of ship, number of ships and priority of cruise line. It really is a toss up and makes no difference for booking.. You may also tender if there is a high number of ships in Cozumel.
There is a flippant answer to the question: What side faces land when docked? The side closest to the dock.
__________________ Cruisemates Community Leader/Moderator
"There is a great difference between being well traveled and just having been to many places." ~Me