zecee: It really depends on your past experiences and what you have access to.
Do you already have a controller?
Have you played similar Action-RPGs (Shadow of Mordor/Batman/Darksouls) before?
If so have you used a controller or Mouse&Keyboard?
I'd suggest you stick with what you are comfortable with if you have past experiences in the genre. It's a matter of personal taste after all.
I personally prefer a controller because of its analog movement controls. I think it is a worthy trade off for the finer camera control you get with Mouse&Keyboard.
P.S. If you go with a mouse and keyboard make sure you tick "Hardware Cursor" in options.