Hmmm, it's always a tough choice. I've been on 2
DCL Alaska vacations and often look at other cruise lines and land trips for Alaska. I'm actually doing a short Princess cruise next year, just to see if we like them enough to take one of their Alaska cruises someday. If you read on cruise critic, most people will say that Alaska cruises are all about the ports and not the ships. I disagree with that when the ports are the same, the ship differences can make a huge difference. There are several days that you will be on the ship the whole time. That matters to me a lot. I bore easily and even though at this point, my cruises are adult only, I know what to expect on DCL as far as service, activities and special dietary needs.
For kids clubs, I've read that often kids enjoy clubs on other lines more because there are so few children that they end up getting a lot of special time with the counselors. I will say that my first Alaska cruise was cold and rainy the first few days (which were all sea days) and many kids seemed to be bored as they were running amuck around the ship unsupervised and getting into mischief. I didn't see that on my past cruise, but the weather was a lot better. So, it was easier for kids to be out on deck and doing outdoor activities if they needed to burn some energy.
If you want to spend a lot of time on the ship doing stuff with your kids, I'd say DCL will be your best bet. I usually cannot put a dollar amount on great times with my family, so I cannot speak to if it is worth it pay that much more money. In my case, it's usually a matter of we will only cruise a particular cruise, so shopping around doesn't matter. We won't do a less expensive one because we wouldn't take that vacation at any price. Not sure if I worded that correctly, but do lots and lots of research.