Both are downright awful when it comes to food. You can eat and not leave hungry at both places, but neither has anything I would consider to be good food for dinner. So, IMO, it would come down to which characters your kids like better, Mickey, Minnie, Pluto, Donald and Goofy or Pooh, Tigger, Eeyore and Piglet?
On a side note, I would consider taking the kids to meet some characters before any character meals. We just got back from WDW this morning and we noticed that there are a good amount of younger kids that get scared meeting the characters. You wouldn't want your whole meal to be ruined because one of your kids got scared and cried the whole meal.