Vastly different tires. Both will do ok on trails, although the big horn will be a better trail tire. If you are into mud, not even close, the zilla/wildtang (same company) will excel in the mud, BH will get you though some mud but not really designed for that.
BH radial vs a bias tire..... The radial will provide a more stable ride, much better puncture resistance, a much longer life span.
Radials are more expensive, but you will be buying 2 sets minimum possibly 3 sets of zillas before the Bighorns see the end of thier life.
Personally, almost any radial all purpose tire will win out here unless you spend the majority of your riding time in deep or thick mud.
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