I'm consindering the Simpson Persian Jar 3 with the following specs for bowl lathering.
Total Height: 112mm
Bristle Loft: 53mm
Knot Dia: 24mm
Hair: Simpson Super Badger
I'm not against one of the chubby 3's or any of the others you fellows might recomend but I'm a bowl latherer.
I have the PJ3 in both 3-band Super & 2-band. Both are excellent and have the "Monica Bellucci" of handles, which as others have said, is perfect for bowls & scuttles.
I agree with what others have said; you don't want a Chubby for bowl lathering. If you really want one, it would work, but there are better options out there...such as a PJ3!!
Of course, YMMV. For instance, I usually bowl lather and a Duke 2 is one of my favorite brushes.