wider is better.... since yes narrow tires dig but what if mud is too deep your frame is going to bottom out and your stuck.... so what I like is wide tires if I had more money I'd go with 14.5 wide rather than my 12.5s.... wide tires with good tread self cleaning lugs is the only way to go keeps truck floating n prevents bottoming out.... my old 97 f150 was running 38x15.5 Swamper TSL radials and it was a tank never got stuck in serious mud.... I almost ordered a set of 35x14.5 boggers but wife says no....