Maxxiss ignitors on the 26er for the loose trails.
Pythons on the 29er for when things firm up. These tyres slip a bit on loose stuff on hills so not brilliant for climbing right now. It will be a different story when things freeze.
i'm going to be running weirwolves on the karate monkey, with a bunch of knobs cut off to make it less likely to pack up. eventually gonna have wider rims for her as well. this will all be testing for susitna.
It really depends. Say you break your arm, then learn Japanese during the 8 week layoff, then make a killing following the Nikkei in the fallout, then it all works out in the end as you can buy all the studded tires and GI Joe with the Kung Fu Grips that you want.
If you don't want to break a limb go with the front, as Sir Jake A Lot suggests, I would imagine. Then throw whatever has the deepest treads on the rear? Though if you hit ice, that rear end will fly out to 90 degree angles in a flash. I've had that happen before and it can be fun in its own way, but also frustrating when you go down hard on the ice. I find that going down on the ice is more fun if you've got some speed.
FRONT! If you lose the front tire it's usually gonna be at speed while braking and not a fun way to fall. The rear is not going to slide out at speed if the front is holding and if it does slide you're most likely climbing at slow speeds. Go with the front if you have one.