Personally, I'm not picky. You shouldn't be picky because some pitchers are good at staying on the outside/inside of the strike zone. If you are going to be picky, you may strike out because you only will swing at a pitch in a specific area.
Edit: It also depends on your pitch count. If the...
In my opinion, bunting is very effective for any age group. Whether that's sacrificing to let another runner(s) advance a base or two, or bunting to get on base.