Which bleaching system gives you the most good results beyond polus or advanced zoom?

To get your teeth as white as they can possibly get, there is no substitute for the KöR system.  Teeth will get whitER with nearly all systems, but if a person wants them as white as possible, there is no alternative.

Whitening results
will always depend on the type of treatment, gel concentration, and natural
color of the teeth. Do your homework to find out which concentrations are
stronger, and what active ingredient they use. Your dentist can recommend the
one that is most appropriate for your individual needs, as everyone’s vary from
one person to the next.