The material of the burnisher head, the physical speed at the point of contact with the leather, the type of leather AND the pressure put upon the leather onto the burnisher are all components of 'what you need to sort out what suits you'.
Unfortunately Mike "the physical speed at the point of contact with the leather" will get you caught up in that. I personally put it all together and try it, raher than working it out, but a large burnishing wheel has a much faster contact area than a small one - watch the inside label versus the outside edge of a vynil disc on a recored player.
BTW, most of my veg tan burnishing I do by hand with a rough rag, but as people of the forum have realised I am a wee bit old fahioned.
Best
H