We were just there in October. For us- it would depend on what FP we could get. Flight of Passage and Slinky Dog would be the deciding factor. Whichever one of those I could book would be the park we would start out on that 2nd day. Now- if both are available- that would be a hard choice- unless I was unable to get one of those on my planned full park day. Flight of Passage is absolutely amazing and Slinky Dog is really cute. With hoppers, you can be flexible- so you can ride the hard to get ride with the FP, and then move to a different park. We got a Slinky Dog FP for the morning of our departure day last month, so we rode that and then immediately hopped to MK.