I have the Duke 2, Polo 8, and PJ2 and all are very nice brushes. The Polo and PJ have very different handles than the Duke and since you already have a short handled Simpsons, you may want to consider something other than a Chubby. If you like the shorter handle, the Chubby's probably the one for you! The Polo's hair loft is very similar to the Duke and doesn't seem quite as dense to me. Could be perception however! The PJ2 has a higher loft and I love the handle! My Duke and Polo are best and the PJ is super and has obviously whiter tips than the best. All are very soft to the touch. I'm considering a PJ3 in super and that may be just what the Dr ordered. DrP that is!!!
Here is a comparison shot with Duke 2 on left, PJ2 in center, and Polo 8 on right.
Tact is the art of making a point without making any enemy. Howard W. Newton