That's all you really need.
3Ds version can not even be played at moderately high level, because its missing fundamental mechanics.
People say it plays better because it has over the shoulder aim, but it actually plays worse because of it. It's a clunky mess. I mean, unless you are the most casual of the casuals and have zero abilities to adapt to any kind of non-standard gameplay mechanics.
MGS 1 to 3 are not your standard TPS games, never were, never attempted to be, and you get the absolute best experience when you play them as they were designed to be played in the first place.