CF Cafe has a delicious breakfast and will likely be easier to get than the other two. A bright, cheery atmosphere. Perfect for a relaxing start to your day.
Chef M's is loud because very popular with families and thus challenging to get. The food is pretty mediocre.
We really like 'Ohana's breakfast. Great service with good variety, well-prepared. And Lilo and Stitch if they get characters back/or have. A bit hectic atmosphere since it's popular with families with kids. Our go-to for MK day, always our first park day.
Enjoy, whichever you choose.