Defender gains tread life by giving up some traction. Premier gains on traction by giving up some tread life. Which is better for your situation?
Here's Tirerack's tire rating chart for our size; that (Michelin) BFGoodrich looks very interesting especially in the regions with snow:
I have had the Defender for the last 20000 miles. I like them. They are quiet (compared to the OEM), they are fine towing the PUP, they are good on curvy roads, in the rain I have yet to have any problems.