which should i get? i ride alot of urban and dirt jumps. i'm thinking either holy rollers or hookworms but i'm leaning toward the hookworms. i need something thick that'll resist pinch flats but i also want them to do well at the dj's. do those tiny knobs on holy rollers actually give anymore traction than hookworms? in the mud i've always just seen the knobs on them get filled and really slick. other good tire suggestions are welcome, the big thing is I DON"T WANT PINCH FLATS!!!