I love the MK for it's magic, but I love EPCOT. I love visiting all the countries and just soaking in all the atmosphere.
Things may change now that we have our daughter though. She made her 1st trip to WDW in January at 3-1/2 months and we are going back in May. I can't wait!
My very favorite is Magic Kingdom..............I cry every time I go the first visit of my vacation.......don't you know I have to pack tissues!! It is almost like coming home.