IG are best because of their defencive capibilitys against rushes (put all tech-priests inside the field command ) The baneblade destroys all, and basilisks earthshaker is enough to put a hole in any mob.
The problem with tau is they lack defencive buildings (turrets and mines). The closest thing to a turret being a broadside and the closest thing to a minefield is the drones. Tau=
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