You obviously don't know anything about tanks. This list is a mix of considerations. The best tank in individual tank-on-tank combat (Tiger) was not necessarily the most practical to manufacture and deploy on any force scale (T-34). The T-34, especially when comparing initial production models, was VASTLY superior to the Sherman. It was equally if not more mobile, while its armour scheme actually afforded it some protection from the more powerful German anti-tank guns (the Sherman, in comparison, may as well have been made of paper and filled with gasoline).