A 400 isn't "better" than a 200.
Perhaps the 400's are slightly.... when backing over previously plowed furrows of snow.... The taller tires and ground clearance are a benefit.
I find that the whole experience had changed when I went to those tall tires in the back. When necessary, you can either drive over and through with a 400 where you generally have to "Grind and Drag" your way with a 200.
For those with prim/proper yards of pavements and borders, a 200 is plenty wonderful. I just picked up another 200 series from a member Bread320i over at GTTalk... the thing blows snow very well. Yet, if you have to deal with a lot of not so prim/proper, the 400's tall rear tires are a better deal. Often, I have to blow yards out before any plows come thru. With a 200, I would wrestle with just crossing the streets.