It's tough to pick one. I am glad I don't have to. Part of me wants to agree with @Marco. For me, La Toja hits a lot of high notes. It is relatively inexpensive. It is small and makes a great travel soap. I find it very easy to lather with it and the lather is top notch. Having said that, I have to go with Pre de Provence No 63. It is also inexpensive. Being quadruple milled it is very long lasting and that also reduces the cost per shave. The lather quality is excellent. The scent though, that pushes it to the top of my list. It is my favorite scent of all my soaps. So let's say La Toja for travel and PDP 63 for home.
I'll pick Klar Seifen, a shaving soap that has no real faults other than price. I was lucky to find it on sale, so pretty happy with it.
People love to complain about the small container. I think the container is made small for traveling. The container just holds the soap, it is not a lathering cup. Take the soap out of the container to lather it, problem solved.
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