I fish about as much through winter as I do summer and I can't tolerate cold hands.
I've been using the Trakker mitts for the last few winters and find them hard to fault, whatever style of fishing you're doing.
When folded back to leave your fingers free the mitt part still keeps the backs of your hands warm (and those all important blood circulating veins on the surface) and they're very toasty when you've got them in full mode with your fingers inside, again there's enough room inside to allow for warm body heat to store which is something I find lacking with the fitted style of gloves.
A big plus is that you can tuck your cuffs in them and cut off that draft potential between glove and sleeve, even in the coldest temperatures I find that they are warm enough folded back so that your fingers are still exposed.
They were going silly cheap some time ago so it might pay to shop around but these are the beasts...
Trakker Carp Fishing NEW Polar Foldback Gloves | eBay
The image doesn't show it but inside the mitt part there are separate finger extensions form the knuckle to around mid- finger which helps a lot...