Well, again, not a simple answer. It depends on the temperature you hike at and the surface you sleep on.
Some examples:
Above 50F, I like a NightLight torso. I have used thinner pads, but this is a compromise between being comfortable and light weight.
On a lean-to floor, I like a NeoAir. Sometimes I use the NightLite for "shimming" a badly off level floor.
For colder temps, I like my NeoAir, NightLite over. Pick some snow to sleep on.
For cold weather, less than 20F, I don't go camping. (I have diabetes.) But when I was younger, we used extra clothing, over a CCF mat, covered by a CCF mat, wrapped in a tarp. Often, this was sleeping over ice, solid snow, while ice-fishing.
Since, Exped and others have released DAM's (Down filled Air Mattress,) or I didn't know about them when I was young…no internet. I would get one of these. Perhaps enhancing it somehow with a second pad as others have said.
Surface coldness you are sleeping on. (Forest duff is warmer than granite.)
Surface hardness you are sleeping on. (Granite is harder than forest duff.)
Type of snow you are sleeping on. (Ice is colder than softer snow.)
Often, (at least I have found) that the problem sleeping on snow is not being cold, but melting the snow underneath you. This can cause your floor or ground cloth to stick. Snow is a good insulator if you can keep it from melting. Any melting will also remove heat a LOT quicker than dry snow.
You will likely need a couple or three different pads. Wrapping in a small tarp or ground cloth will add a little and keep them mostly together.
