My buddy used to have Realtors on his Warrior and those tires were awesome on trails, dirt, mud and even in the snow. Just rember though, any of the more aggressive tires you originally mentioned are gonna rob power from your 230cc quad.

Oh I won't be getting these for my grandaddy Zuk, I will be getting a new (either brand new or new to me) quad sometime soon. My choices are Zilla, LT250R, the Z or maybe even the EX 400, or who knows. I might, and this is a BIG might, just get a Warrior (very doubtful).

I would go with the Sprider Tracs or the Dirt Devils, in that order. Since you are going to be mounting them on a sport quad I would lean more to the Spider Tracs due to the fact that they are a little lighter and perform better at speed. I can't account for AT Devils but the XTs are a great tire for anything except serious mud, but they are a heavy tire.

All-Terrain/ Intermediate mud tires
 

All tracks perform great in mud. They are a more aggressive knobby tire.