I played with them both extensively at Best Buy while the wife shopped, and after about 30 mins of handling the D70 the muscles in my right hand started to cramp up (from turning the dials), which immediatly went away when I picked up the 20D. I have rather large hands, so for me the bigger body is a big +. Also, the 20D is wicked fast. FWIW, I have a catalog page for the 20D on my fridge.