I don't use either of them to mix the lather to the mixed state, I load it in the bowl it came in, then transfer to my scuttle
the problem with lathering on top of your soap is that you will have a very difficult time hydrating your lather properly. you are trying to attain a certain soap to water ratio while also whipping the lather.same here. they are to apply the soap to the brush, that's it. you wouldn't want to make lather in either of them.
Neither. As stated above, they're for loading not lathering. In any case, better is always highly subjective. You can poll but that won't tell you which you'll find to be better. You'd need to try both to determine for yourself.Tabac bowl VS. Mitchell's Wool Fat bowl: Which is better and why?