Hand size should have a significant role in deciding what size handle to use. I have rather large hands; the dimutive handles found on brushes like the Semogue 610 and B&B Essential are OK but are far from my favorite. The Vulfix 2235/2236, Semogue 1305, SOC, and 1800, and for sure the Omega Pro 49 are great manly-sized grips which are fine for my application. I'm ordering a new bespoke brush which will retain the Classic L7 shape but measure in about 5mm larger than the original. Knot will be a 25mm Muhle STF set to about 50mm. Thinking this might just be the Swiss Army knife of all my brushes. That title is currently held by my Simpson Colonel X2L, a great all-purpose brush in its own right.