of these two- Berkeley and special witch would you pick for bowl lathering creams
I bowl lather my Duke 2 all the time with no problems. As long as your bowl isn't excessively deep you can bowl lather with any brush.
In my opinion they are pretty much comparable and better suited for face lathering. If you want a great Simpson for bowl lathering and in a good price-point I'd get a Colonel.
I pick Simpson M7