Exploring in first-person is much better on PC thanks simply to well implemented mouselook. Pad controls are borderline sluggish, seemingly to give your actions a sense of heft that fits Red Dead Redemption 2's methodical pacing. It's great to be able to quickly look where I want to without dragging my view around with a stick. It also means you can play the game as a legitimate FPS. Naturally, the game switches off the pad's auto aim when you start playing with a mouse, and you can switch freely between mouse and pad if you prefer riding a horse with a controller.
The combination of 60fps performance and mouselook significantly changes the way the game feels to play, which to me matters more than visual improvements to a game that looked great already. As a PC player I'm used to being able to dart around with my view and react to the game world with almost unconscious flicks of the mouse. Pad look creates a small amount of friction between my intention and the way the game responds to that intention. Removing that friction simply makes the game feel better to me.