Sealants are often in reference to Acrylic Polymers

They are much more durible than organic waxes like Carnauba, have a higher melting point, and have the ability to be layered. Each layer provides more protection/duribility, and more shine.

Waxes are often in reference to organic waxes. They have a low melting point, can not be layered, and have a short lifespan.

P21s is pretty good, but Souveran is unreal. It is so good, that it is worth it for $70 a can.

Liquid glass is good, but its pretty expensive and I haven't found it to last as long as other polymers I have used.