Personally I would go for the ATs. I run General Grabber AT2s (same tread pattern as BFG ATs) and my hilux was virtually unstoppable in the deep snow and the ensuing floods we had up here. They are also pretty good on the road with minimum of noise and plenty of grip. I have also had no issues with taking the truck off road either.
I even got 40K miles out of them with probably another 10K left in them. I was so impressed with them I replaced them with the same and fitted them to my 80 Landcruiser too.