They both lather well and shave well. Lather from Tabac is more protective. Proraso takes more swirls to lather, but it rinses cleaner and easier. Tabac seems more moisturizing to me. I like the menthol in Proraso, but prefer Tabac's scent. Eucalyptus reminds me of Vicks Vaporub, sorry. Tabac is very hard and will last longer. Tabac wins by quite a margin, but if it is very hot day, I will go for Proraso.
eh ymmv
eh ymmv