I' ve seen three big test Nokian won one; and the Goodyears have won two. I guess it depends on your bias dry/wet/mud/ice/snow.
I am a big fan of michelins, but don't think they are the best in this class generally. My only caveat is longevity, usually Michelins out last others, but with low temperature rubber, longevity may not be the biggest decider. Mine came with the Goodyears Vector2, but the Nokian have better sizing (for me), plus also they have better mud/grass grip.
The Michelin design looks lacking; no sipes on the tread.
2015 Auto Express All Season Tyre Test - Tyre Reviews Test 2 Nokian win (no michelin in the test)
From the web:
Michelin discourages people from describing the CrossClimate as an 'All-Season' They describe it as a Summer tyre that meets Winter tyre standards.
Personally, I think that is confusing; the CrossClimate clearly is an All-Season but perhaps Michelin's guidance discouraged AutoExpress from including the CrossClimate in a comparative test of All-Season tires. - 2015 test
I think may be the Michelin aims at a slightly different segment, better in the dry, but not so good in the cold/snow, and this is born out by the test data.
@Polzeylad, do you recall the test data/ comparison data you have seen?