Ok, I figured we'd do the opposite of the "worst" thread. Now I'm aware this is going to get some convoluted responses. (This soap is best for X This one is best for Y, etc)...
So, how about a theoretical.
The technology to produce soap is lost. I don't know. Global Warming did it.
You've shaved all your stockpiles away, but hurrah! You win a lottery for a lifetime supply of one of any type of soap (from the nations great shaving soap reserves) the condition is that you may not sell or share the soap, you get the idea. Of course you can't afford any other soaps, since they are far more valuable than gold now.
What soap do you pick?