Very happy with my Pilot Alpin's on 18 inch wheels, standard 225 width. Although narrower tyres would perhaps have cut through the snow and little better, i do like the extra width for additional grip at times when it isn't snowing.
Although there was a momentary flicker of the traction control light when driving over some very hard and very shiny black ice a couple of weeks ago, they've been rock steady this week in some pretty appalling driving conditions.