I was trying to decide between the two as well. I booked Chef Mickey's then called my 5 year old niece to let her know she would be eating with Mickey.
Her response was: "I'm not eating with that mouse" 
She's not very fond of the characters.
I sent a youtube link of the stepsisters at 1900 Park Fare and I got, "I
will eat there. Can I yell at them if they yell at me?"
That's how I made my decision. We will be eating at 1900 Park Fare