Trail model has served me well for years. 10" x 56"
Used a pair of those for two winters in Fairbanks. They do float.
True, the only downside of these is: 1) maneuverability if you get in a brushy area, and 2) you can break them if you span brush or limbs under the snow. I'm not up on some of the modern snowshoes, but the G.I. Surplus magnesium models are pretty cheap and definitely tough.