No one would recommend a 21" barrel for trapshooting regardless of choke. Long barrels make for smoother swinging guns and if you can handle the longer barrels that's the way to go.
Are you leaning towards the 21" barrel for another reason? You did mention the Youth model so I assume you're a young and/or small person. In that case, it may be more proportionate to your size.
Barrel length doesn't affect choke performance. Full choke from a 21" barrel will pattern similarly to a 28" all else being equal. I agree with those who suggest modified choke for 16 yard trap.
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