Imagine 6 people in front of you, while you have a intervention... your done for.
Now, Imagine yourself with a 50. Barret with 6 people in front of you
You can spray the hell out of them, while you go bolt action on all 6 guys with the intervention!!! lol
So I would say the barret for public matches, and the intervention for public matches too, but mostly for 1v1 quick scopes... it only makes it look right.
Both sniper rifles are A++, but the barret is WAAY quicker and might come in handy.