The simpler the better. I would also go for the fairly thin gloves combined with insulated mitts. The less you hold on to the cold camera/tripod the better also.
Personally I find it quite funny how technical and complicated this glove business has become in my lifetime. As a kid the only kind of hand wear we ever had were the wool mittens knitted by our mothers/grandmothers. One pair if the temps were over -20C (-5F), two pairs if colder, and it was sometimes -40 C/F! People who need dexterity, like those who net fish from under the ice, just do it barehanded. Nobody ever looses any fingers, they get used to it and the body compensates with better circulation. Naturally the water is, under those circumstances, relatively warm!