Both would work well with a snowy backdrop. I took my new to me AN/PVS7D out last night for deer culling work with a buddy. He wore the NVG and I carried an older ATN Thor 1-4x 240x320 scope. He wasn't able to locate animals nearly as well as I could with the thermal- no snow here in Ohio. He had my ATN Thor HD 640 2.5-25x mounted on his rifle, so he'd switch over to thermal for shooting and target confirmation. The critters didn't have much contrast with their surroundings. Being able to see something requires that the object be a color that contrasts with the background, or that the object be moving relative to the background. Thermal is very sensitive to temperature differences, so living creatures (and recently dead ones) will put off enough heat to be easily noticeable in the scope. This contrast makes identifying animals very simple. The night vision simply increases light. So, an animal that's well camouflaged in the daytime, will be equally camouflaged at night. So, night vision will be an excellent tool in the snow for hunting coyote and fox- they contrast well with white and will stand out very distinctly. Night vision gives you advantage for navigating at night. You'll find that grass and twigs are very nearly air temperature at night, so they don't stand out when walking with thermal. You'll be tripping over things everywhere you go. Night vision goggles are truly amazing for moving around at night- you'll see every blade of grass. Always pros and cons to everything! I have an IR laser coming in a couple days for aiming with the night vision. It's only 4 oz and puts a beam out 400 yards. Put the dot on the target and you'll hit it (if you use the correct holdover for distance), whether your rifle is shouldered or you're shooting from the hip.