I've got some hestra anthony boronowskis are they are so sick. leather but with a layer of waterproofing in them too. I've only used them for a day, but they kept my hands so warm a dry. quite pricey but worth it if you can get a good deal on em.
Gore-tex are probably warmer and definately drier, but I prefer leather for the dexterity. Also, I live in Australia where the snow's really fucking wet and I don't have too much of a problem with my leather gloves getting wet (unless you're packing snowballs or something), so I think they'd be fine for someone in North America
Gore-Tex is just a waterproof breathable insert in gloves...I rock Dakine Cobra gloves...mostly leather and gore-tex. Love them, thats all I use. Every now and again I rub Nik-Wax on the leather to protect it and keep it supple. Keep my hands warm and 100% dry.