Major problem with Geneva rootstocks?

A year old but I just came across it recently - Some interesting stuff being looked at in regards to winter hardiness, but a little strange they didn’t include good control comparisons in the trial - no B118 or M111 for comparison:

https://blogs.cornell.edu/enychp/tree-fruit/apples/tree-fruit-apple-cold-hardiness-research-update/

I just posted my deliberations… leaning towards B118, but still considering m111 or G210

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