I think if you can it is better to play an up the middle position.
Eventually you will need to hit at every position but at a corner you need to hit more and also for power if you want to play at high levels, i. E an "empty batting average guy" might not get to play at a corner in a high level college or even pro program while a guy who can play up the middle still needs to hit but might get by with little power.
For example in mlb a guy who hits 270 with 8 homers might play if he is a good shortstop but not if he is an average left fielder.
Still nothing against playing multiple positions but if you can make sure you are competent at playing the toughest middle position (CF or SS), because if you can the coach doesn't need to see you playing second, third or a corner OF, he will just assume you can.
That doesn't mean you have to play every game at short or in center but at least you have to be able to play there.