I think it is based on personal preference. I'm not really a panel person so just walking around the show floor for a day or two is plenty for me, but if there are panels you really want to see each day then by all means get the 3 day.
Does anyone have one adult and one child ticket for Saturday for D23 that they don't need.
We couldn't figure out which family members were going to be able to go and at the last minute decided and it was too late to get tickets. My step daughter really wants to see the Disney channel stars.
A love of Disney that sometimes borders on the edge of crazy ---but I'm okay with that