I haev looked at the websites for both of those shows, and while I don't have an opinion on which one you should see, I did want to mention that the best price I found was right on their own sites. I had noticed the 1/2 off vouchers being offered on e-bay, and the some of the other ticket outlets offer what is a deal off the full price. But their own sites have the tickets for $25
A friend of mine did the Pirate's show last year and her ds who was 6 at the time absolutely loved it!!! This year, (they just left today, I'm so jealous!) they're doing Medevil Times. AAA has discounts on a lot of these too.
I have not done any of the other dinner shows, but I did take a group of middle shcool aged Girl Scouts to this a few years ago and it was actually very fun!