I asked those questions because currently I do not see chubby super 2 band brushes (not counting manchurian knots) on the official Simpsons web page...are the 2 band supers made especially for the vendor in Ireland ?
Several vendors carry Simpson 2-band brushes at various times. You can currently find 2-band Simpson Chubby 2 Supers at westcoastshaving. You might also check with Bullgooseshaving.com as he sometimes has them in stock as well.
As to the original post regarding Chubby 1 vs Duke 3. The Chubby 1 is a denser knot than the Duke 3 but the handle is relatively small. I have large hands and it doesn't bother me, but you will definitely notice a difference in the handle size between the Chubby1 and Chubby2. If you are concerned about a small handle, the Duke 3 might be the better option.