Intellect is one aspect of power. Also, even though he failed on Zannah, he had the ability to do it to the lesser minded.

Reasoning? Now, Bane has exhibited the ability to literally take control of another person's body. His pure rage is incredible and he exhibits the ability to draw upon the dark side in ways not shown by most other Sith.

I would say in terms of Sith: 1. Abeloth (Not sure if she counts as Sith, but oh well) 2. Darth Bane 3. Darth Revan 4. Darth Caedus 5. Naga Sadow 6. Darth Sidious 7. Darth Sion 8. Sarasu Taalon 9. Garen Malek 10. Darth Wyyrlok III Jedi are as follows in my view: 1. Luke Skywalker 2. Satele Shan 3. Cade Skywalker 4. Yoda 5. Kol Skywalker 6. Ben Skywalker 7. Anakin Skywalker 8. Jaina Solo 9. Leia Organa Solo 10. Kyle Katarn