Cornwell: classic design, beautiful, thick chrome, unique shaped ergonomic handle; I got a used one... the chrome was flaking off the end of the handle. The shape of the end of the handle; I think is prone to this, from contact with cement when working, because of the nature of the shape/design, it sticks out and will be the primary part of the ratchet that hits the surface of your work area. I sent mine in to Cornwell and they sent me a brand new one. The tooth count is low but the ratchet design is tried and true. It really feels like a pro quality ratchet but is a little on the heavy side, IMHO.
Snap-On: what can be said that has already been said a thousand times in other threads; great ratchets and modern high tooth design. Only negatives are the selector is a little to wimpy in the 1/4" sizes, some have said they are prone to breakage (I like the 900 series selector; sticks out enough to be a positive feel and easier to "select"). Because of the CNC/CAD design; the edges of the body/head are sharp and the overall shape has lost the rounded and organic quality of earlier designs. Great ratchets; I wish all mine were dual 80s but I appreciate all my earlier series as well.... 70s, 700s, 800s, 900s, etc.