If you’ve already made your reservation for Chef Mickey’s, KEEP IT!!!
If you’re still trying to make up your mind, all three are a great choice.
I think in order by food, I’d say 1 CP, 2 1900, 3 Chef Mickey’s.
For characters, both CP and 1900 have Pooh and Tigger, but 1900 has face characters (humans who talk) in Mary Poppins, Mad Hatter, and Alice.
Of course, CM has Mickey, Donald, Goofy, Minnie, and Pluto.
Chef Mickey’s is always the hardest to get a reservation for and I have almost always been able to get breakfast reservations at the other two and all three are on my favorite breakfasts list.