Well, what feels most natural in your hands and which one gives you the closest shave? So far, I have a 5/8" and a 6/8". The 5/8" is a Dovo Forestal with Cocobolo scales and a 6/8" Dovo Best Quality. The Best Quality razor has synthetic scales that effect balance much more than I thought they would. The 6/8" with the plastic scales gives a more tip heavy feel while in my hands compared to the Forestal which is thinner in profile with heavier scales. The 5/8" seems more easily maneuvered resulting in less nicks and a cleaner shave. I never thought that such small differences in weight and balance would effect my shaves but they do. Which do you prefer and why? Thanks!