We have taken many,many, so many cruise in Alaska and it really makes little difference which side of the Vessel your stateroom is.
Heading north from Vancouver your ship will usually dock on the Starboard side. The same with Ketchikan. This means you may enjoy the sights of the harbor from the port side, if that is where you are . But then you can watch the float planes taking off and landing.
You can be assured of one thing whichever side of the vessel you are on. The whales sighted always seem to be on the opposite side of the vessel where you are. By the time you get to the other side, the whales are usually gone.