Winter tyres tend to have wider grooves, and up to a certain size (225 iirc) directional patterns offer the best water evacuation, you do not -have- to have circumferential grooves for efficient evacuation. Not all winter tyres are directional, and each tread pattern has its own merits. You can have either a summer, winter, all season which are best, worst, average in the same given size and the seasonal designation does not dictate which is best, rather the particular tyre in the particular size on the particular vehicle, in the partucular conditions etc etc...
Some winter tyres do in deed shift water better than a lot of summer tyres, but some summer tyres may beat others.
You cannot quote individual parts of a highly complex system to blanket all systems as being the same.
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