XMT180 -- great price point, easy to use, allow to haze, great for all colors.
Maxwax --easy to use, can WOWO, very deep and wet, great for metallics and light colors especially. Appears to enhance metallics with some reflective polymers.
Souveran -- simply no equal in depth and wetness, not very reflective, primarly designed for flat colors like red, yellows, and blacks. Can be used on other colors but does not enhance metal flake.