True Dat! It DEPENDS on what you mean by "best".
Durability = SG without question.
Easy to apply = UPP (excellent results, too) and Wolfgang are about the same whereas the SG is a bit finicky IF you don't put it on THIN.
Looks = Wolfgang if you want warmth and glow (especially on darker cars but the warmth, depth and glow is also there on lights) or SG if you want a plastic type shine at the sacrifice of depth.
Each is excellent and easy to use - even the SG - and each gives excellent results. So in a sense, each of these are "best", it just depends on the expectations.
The "best" is like asking who the "best" athlete is Lance Armstrong, Michael Jordan or Jerry Rice - it DEPENDS! But no matter the choice, you've got a winner!