I was considering which all-season tyres for our van and I came across this group test of all-season SUV tyres which covers most of the tyres most frequently recommended on the forum. An SUV tyre test is probably more relevant to the kind of tyres we go for as we want some reasonable grip on tracks and wet grass on campsites etc. I know some tyres (e.g. michelin cross climate agilis vs cross climate SUV) come in van-specific variants too but it's probably more representative than looking at pure car tyres. The other interesting thing is that it includes an AT tyres too (General Grabber AT3) too so we can see the kind of compromises we expect on-road for this kind of choice. It's a shame they didn't include some kind of off-road grip test too though.
My general takeaways are:
1) All-seasons really work, they get the vast majority of snow performance of a dedicated winter tyre with little penalty to the summer tyre in the dry. (Major caveat though: I can't see at what temperature these tests were done in, at e.g., 7 degrees celsius you very much expect this, would be more challenging for the all-season tyre to compare them at 25 degrees.)
2) If you pick a decent all-season SUV tyre (Michelin CrossClimates, Goodyear Vector, Vredestein Quatrac, Nokian Weatherproof) there isn't too much to pick between them in most of the tests. However, the UK price of these varies significantly, so some look rather better value than others.
3) Actual AT tyres are heavily compromised on-road, some of the tests such as wet-braking look slightly scary.
Anyway, before I forget, the actual link!
2018 Auto Bild SUV All Season Tyre Test - Tyre Reviews