I don't expect the Switch version will be the best way to play on PC. It will likely be 30fps, with FSR and filtering that will make it look worse even when upscaled. There may be mods to unlock the framerate and remove any filtering although it's no guarantee. I wouldn't be surprised if they downgrade the models and make a bunch of other changes which will make it inferior, and there'll be funky behaviour with LODs. All stuff which might get fixed with mods but still likely to be an inferior experience.
If you have a decent PC, RDR1 through Xenia is a beauty. Proper 4K with unlocked framerate. Can't be beat.