For me it's simple like 1 + 1 = 2 :

* IF a RPG has real time combat I prefer to use a "controller" ...

* IF a RPG has Turn Based Combat I prefer to use mouse AND keyboard, especially Keyboard commands !! (I really don't like a mouse-repetitive-clic-activity anymore !)

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !