We were on the port side and it was amazing. However, as others have said, while you're cruising down the inner passage, it really doesn't matter. The only time we were really glad to be on the Port side was at Tracy Arm. As noted above, the forward and port sides see the glacier first. They kept announcing that they were going to turn the ship and they appeared to be trying, but to our eyes they never made that full rotation. We assumed there was an ice issue and couldn't turn the ship all the way around. The entire time we were at the end of Tracy Arm we had a view of the glacier (mid - port balcony cabin). We felt bad for the starboard side cabins.
We also had a great view when docked at each port. Though from what I understand, they don't always come in the same way at certain ports, so I don't know if we just got lucky.
All in all, I'd book port again just because it worked out so well the last time!