I suspect it's more down to the fact a 10" tyre has a much taller profile than a 12", so that would help in snow.
I have to admit, I don't use mine all year round. They go on in March and are illegal by November, at which time, I put my winter wheels with A008s on (at the moment they have Falkens on, which was a mistake). But when I tried them in the snow they were surprisingly good
The 032/048R tyres are definitely better than the 008s in the wet though, as the latter don't have any water clearing jets on the outside, whereas the former do.
But back to the OP, 539s are an excellent all round tyre that will be good in dry and wet. You won't be disappointed with them.
When do you get to do all this testing? you're 16?