I would chose a crab based on: size/shape requirements for the site, flower and foliage color. based on personal preference, disease resistance, especially to apple scab and fire blight, and finally, persistent fruit.
I find that the right type of persistent fruit-glossy, not mummified, retaining good color, is more important than flowering, as it lasts much longer. I can't tell you which you should prefer, nor do I know the peculiarities of the pathogens in your area. What works in one area will be a scabbed-up mess in another, and even with that said, these pathogens are plastic, changing and molding themselves over time, so what worked well ten years ago may not now.

+oM

I absolutely agree on the non-mummified fruit. I cut down a very large healthy Golden Hornet because every winter it was hung with the depressing, brown carcases of rotting apples which only fell off when the new blossom began to open. That's saying something because I tolerate a lot of imperfections in plants and am usually highly resistant to destroying them.

Floral i am shocked to hear you did that. lol. I dont have a crabapple tree but little fruits be left on it does seem like a big deal to me.

If the little fruits were just that I would have had no problem with it. I left it for fifteen years. But in our dark, wet winters looking out through the rain at a less than shapely bare tree a few feet from the windows festooned with what look like sodden mummified baby mice for 5 months got too much. Some crab apples retain their fruit all winter in good condition and they are a cheery sight on a dark day.

Fireblight, scab and cedar apple rust are serious diseases in many parts of Maine that effect crabapples. Close to the coast powdery mildew is also troublesome. Then there are the insects... I'm not sure how you narrowed things down to Robinson and Snowdrift, but I would check with County Extension or U of Maine to see which - if either - is well adapted to your specific area. A trip to O'Donals Nursery in Gorham would also be worthwhile for their input.