Ive got no experience with that one, but I love crab apples

I don't have any experience with Brandywine either, but according to the Missouri Botanical Garden it is "moderately susceptible to scab and significantly susceptible to rust".

Brandywine Crabapple

Well rust is a problem here with all the junipers in the area. I should get another Prairie then, or something else.

Here's a tool that might be helpful.

The supplier I like dealing with also carries Selkirk Crab, and indicate strong resistance.