U can be good with both but what i noticed so far, is that u swich attack sites "better/faster" with mouse and on the other hand its easier to block with controller. No matter if u play with controller or MK its just important which u are playing longer and u get used to as streamers show. Most of them are playing with controller other ones with MK and i watched some of them they make MK look stronger than controller.
You can change all the binds for the keyboard, but you cannot bind to mouse movement, like "guard up / left / right", and the game doesn't have invert Y axis for guard mode, so, in my case, the keybinding needs more work.
It forces me to learn how to use the mouse again with normal Y axis. It's taking its time, but I'm getting there. It would still be adequate and normal that all games had invert mouse options (that work properly) for people who don't want to go through this process, especially when the directional combat is taken from Mount & Blade, a game that provides the option.