Mouse and keyboard. I’m not buying a controller for a PC game!
I suspect a lot of people who are using controllers on PC also own at least one console and are using the same controller. Controllers for the Xbox 360, One and X/S, PS3, 4 and 5 and the Switch can be used on PC relatively easily and older ones can work with an adapter.
I wouldn't buy one for the rare times I use it on PC, but when there's one in the room already which will work it's worth trying.
PC EU player | She/her/hers | PAWS (Positively Against Wrip-off Stuff) - Say No to Crown Crates!
"Remember in this game we call life that no one said it's fair"