Pro's and con's to both yo. The biggest deciding factor for me was I HATE having to bring up a menu to get to another menu. Example, to use a potion, go to the journal, open inventory etc you have to bring up the radial menu FIRST. With KBM you can press M for map, I for inventory, J for journal, etc. Which is efficient and time saving.
Honestly it's 50/50. Try both and see which one you prefer.
Also, the controller really tired out my hands. Holding R2 for secondary spells, and the other button for the wheel. Ehhh.