I've never been to Cafe Mickey and I really like King Ludwigs but if I had children I'd take them to Cafe Mickey for sure. King Ludwig's is nice but it's just a restautant at the end of the day - no characters, and no real theming as the inside is so big that you are sat a long way from anything that reminds you you are inside a castle.
We must try Cafe Mickey next time we are there - Denise and I haven't done a character meal since December 2003 and we'll be (hopefully) with my little brother and sister so they'd love it.