Food-wise, Boma, hands down. We always have our own vehicle so no hassle getting there, but it's worth the trip, regardless. When we go to Boma for breakfast, it's usually on our "down" day. We also like Crystal Palace (for the early park entry as well as the food/characters). Haven't been to 1900 in a LONG time, so can't really comment except to say we enjoyed it 15 years ago! We are not fans of Ohana breakfast. It's loud, crowded, and oftentimes it's hard to get your server to come to your table if you aren't seated in the "main" area. The food is also pretty mediocre.
AVOID Chef Mickey's if at all possible. It's so loud, and SUCH a mess. We have been a couple of times as the kids liked the interaction, but the food quality is low and, as I said, it's such a mess- food on the serving table, food on the floors, food all over the place at the cereal and dessert stations. UGH. It smelled like the garbage/dish room at the college cafeteria where I used to work. ICK.