The one that everyone should try at least once?
What is the Tabac of shaving creams?
My choice would be SMN. It is very similar to Proraso but i feel it is a must try and the equivalent of what Tabac is to soaps.
What is SMN?
Musgo Real, Speick and Proraso, all three would be contenders. These are definitely must tries for wet shavers.