Aim Assist is the single worst thing about console multiplayer. It limits your skill threshold significantly so I always prefer disabling it yet gives your opponents just enough unfair advantage to make it worthwhile. It undermines the competitive balance of a game to the point that it's baffling how it was allowed to become a standard thing to begin with. It's lazy and caters to the lowest common casual denominator.
This is the reason I'm still playing Uncharted 4 MP, Rainbow Six Siege and PUBG on consoles. Because these games respect their players enough to not hold their hands w