Missouri Botanical Garden’s Page on Cardinal:

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=256550&isprofile=1&basic=Malus

On Royal Raindrops ‘JFS-KW5’:

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=270950&isprofile=1&basic=Malus

All their crabapples and apples:

http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderProfileResults.aspx?basic=Malus

It looks like both your choices have good disease resistance, though colors are quite different. Besides disease resistance being a factor, along with your other ornamental characteristics, look at the overall size and shape of the tree since there is a huge range among crabapples.

Here is another resource for crabs, which though less complete as far as number of plants has a lot of detail on size, shape, fruit, and disease resistance. Both your varieties are on it, along with a bunch of others. They do have different shapes and I wouldn’t consider either to be really pale pink.

https://www.jfschmidt.com/pdfs/JFS_CRAB_CHART.pdf