Best soil in NZ for mx

if you are looking for all around Pukekohe Club just south of auckland run a clay track all summer (harrisville) and then the sand track at mercer for the winter, both have had Nationals on them, Harrisville is considered one of NZ best tracks,

Taupo way on the ash is better for winter,

remember we are small, so anywhere in the upper north island will have multiple club days within a couple of hours most weekends,