Specialized ground control bliss2 ready 2.1 29er.
Absolute bomb for winter conditions. The tires don't harden up even in extreme cold. Low rolling resistance on snow. Supple casing follows snowy ridges well and keeps grip on even the most technical snow trails.
Doesn't really work as a rear tire. The smallish knobs don't give enough steep uphill traction but as a front tire very good.
requires a bit higher pressures due to very thin casing and sidewalls. Work best as tubeless. These will be my go to tires from now on.
light
If only these were made as 2.5"

Schwalbe Nobby Nic 2.35" 29er
Also good. Have not tried as a front tire but as a rear tire works very well. Gives amazing grip on steep snowy uphills. A bit thick but stays supple in extreme cold. Allows low pressures. Heavy.
Rolling resistance on snow is ok

Schwalbe Hans Dampf 2.35" 29er
This tire SUCKS!
1) the rolling resistance on this tire is amazing. It adds something between 50-100 watts to your rolling resistance. No, I'm no kidding. It's friggin ridiculous. It would be more efficient to ride with a empty tire than with this. I can't even... sigh
2) Absolutely no grip in sub freezing temperatures. This tire will wash out in every corner even in packed snow (where it's should not be physically possible). It locks up when braking in hardpacked snow easier than a slick.
3) the tire hardens to a rock in sub freezing conditions. It looses all suppleness and it doesn't really matter whether you have 1 bar or 3. The tire is similiarly hard regardless of tire pressure.
4) heavy
5) develops cracks in sub freezing conditions. Aka. cracks which go through the tire and leak out all your air. I noticed the cracks after a catastrophic failure in the woods. The tire has ~100 different sized cracks from 1-3cm in length some going through the tire.
6) the extra width doesn't really give extra float due to above
All in all I am very disappointed in this tire. Schwalbe should have warned buyers that this tire should never in any conditions be used in the winter.