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The two tubs I favor most are Stirling (for being so flat and wide, though I'm not the best fan of their soap) and Soap Commander, who fills an 8oz (pretty deep) tub only 6oz full. Makes it extremely easy to lather in the tub (no bowl or mug needed). Soap Commander is also my favorite soap.
Another nod for the Tabac - MWF's olde bowl is nice, but the soap is finicky in my water. The run of the mill flat plastic ones stack better/more securely, but the question was which I like best, which will never be plastic packaging ..