Hi, Shari ...
It depends upon the direction in which you are travelling. From West to East (really South to North) the port is better. The other way, starboard.
Usually (which is not totally predictable) cruise ships are on the southern lock set so you can see more of the action.
Just to make sure, make friends with someone on the other side of the ship.
Take a LOT of sunscreen. And, before you go, read "The Path Between the Seas."