As someone on PC where its a pretty even split, I find it hard to tell. There are some blatant tells of someone being on Mnk like backsliding, snap skating, and hitting shots in the air, but just a regular good player not doing any flashy movement tech could be on any input. Some of the best players I know are on controller with 16+ sens with max sprint turn speed and just use low ADS sensitivity so they can move around quick and still have control over aim. There are third party controllers that are better due to lower latency etc but its marginal. You can say controllers with paddles/extra buttons (dualsense edge, xbox elite, scuf etc) are better but I would argue that they are kind of a gimmick, I had a paddle controller for years and they dont really let you do anything you cant do with a stock controller. The default button layout in this game is really bad imo and if you can get used to bumper jumper and/or puppeteer it is worlds better for pvp and lets you do everything with a stock controller. Id argue that bumper jumper is bare minimum.