Durability layer under Souveran or Fuzion?

I know I can count on this forum, the wealth of expertise and product experience is just incredible.

How does Souveran or Fuzion top Collinite 845? Or is there a better wax or sealant to use under one of these waxes for a daily driver for durability and protection?

( this is for reference on a friends Black Mercedes which is a daily driver ).

Thanks again!

Klasse High Gloss Sealant works great for me. It is an extra layer of protection (synthetic) that you put on after you wash/clay and before you put on your wax of choice. It gives me at least 6 months extra protection that works with my top layer of wax and looks good as well.

Second the Klasse twins recommendation.