If you could swing it I would recommend EMM and HDD. We tried HDD for the first time 2 years ago and my then 5yo said within minutes of the show starting that this was a new tradition!! We have been twice now and it will be one of the first reservations I book for our September vacation! I thoroughly enjoyed the show but seeing the smile on my DD's face and hearing her belly laugh over and over again made it the best!!
I know it's more $ should you choose to go to EMM over the CP breakfast but if you can do both EMM and HDD I don't think you would be disappointed!
I have read others discuss the travel time and personally I find it's not bad at all. Just outside the MK you hop on a boat and in 10-15 mins you're at the dock. A quick 3-4 min walk to Pioneer Hall.
Please give HDD a try - I think you'll be glad you did!