Every time someone brings up a controller vs mouse and keyboard, most of if not all comments will push towards the OP to “switch to mouse and keyboard” because “it’s better!”
In my eyes, the person is already accustomed to controller, they’re used to the sensitivity, and if not it’s a quick change.
If they’re going to get used to mouse and keyboard they need to:
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find a reasonable mouse
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find a reasonable mousepad for their situation
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find out if they’re a wrist aimer or an arm aimer
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make sure their windows mouse sensitivity is set to 6/11 for some reason otherwise everything else will be messed up
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find their “optimal sensitivity” many of which tutorials are (subjectively) hard to find (the good ones)
I’m both a controller and mouse and keyboard user but I find it easier to aim with a controller. It feels natural.
If you mean for casual play, then use whatever you want.
If you mean for competitive play, then until you specify the game, this post is pointless. Lots of competitive Apex Legends and Halo players use controllers, but you would never in a million years catch a professional Counter-Strike or Quake player using a controller.
No sun assist on those yet