i like the pro line square fuzzy for my dirt outside. its hard, very hard, with alot of sandy silt on top. m2 square fuzzies hook up really well. if its any looser on top, id go with step pins, always with firmer foams.
when its really dry out i run fuzzies up front too, they bite a little bit better than the losi directionals which i swear by. some argue with me, but it does hook up remarkably well. if its not too dry but not damp, i run losi directionals up front and fuzzies in the rear, usually in m3. i burn tires up fast but they really claw through the loam and corner great, but they can be a little too grippy. i switch back n forth between m2 and m3 depending on the silt.