megs burgandy is a pretty aggressive pad and you shouldnt need it unless you have some really hard clear...
I like 83 a touch better than OC, mainly due to OC taking forever to break down completely, especially via PC. You will be working the OC for about 5-8 minutes to break it down, and 83 for about 2-3 min...if time is money, then I vote for 83, if you have all day, then I think that OC gives a shinier shine
OC on rotary is another story and works really well and breaks down faster...