I think a spool in the back would be fine I'm stretching the jeep so longer wheel base will help even more 
As for highway driving in the winter I drift everywhere anyways so having it locked is just gamma help with even more drifting 
And for tires I can only see it eating tires while turning 
And I only need to turn 6 times to get to work 

And or the savings I can put the money else where 
I only got 3 years from my mtz's.  So once the jeep is built it will no longer be a daily driver 
Spool it is for the rear 
SPOOL IT MAN!  ... it's very predictable on the road ...I got mine delivered for about $170-190 and a detroit for the front. Stan can hook you up. 
It does not chew tires that bad. I ran a Detroit locker in my 8.25 for years and I had good life on my tires for a tire with agressive treads.
I like the NO maintenance part of it....
Selectable lockers are a pain in the butt.