This gif is mesmerizing.
EDIT: Though I'm not going to say whether AR or BR starts is better, I definitely try to utilize the sandbox more with AR starts, than BR starts, which you kind of see an emerging meta game almost, where you see players start to fulfill differing roles on the team barf on the weapon they had, which I've never really seen in any other halo before.
But BR starts is nice because you immediately have a precision weapon, and it's fucking embarrassing to die by an AR rather than a BR.