Which one has better anti-air?

[Garban]

I was just wondering what everyone's opinion on which AV BFR (Pilot gun) has better anti-air potential; the NC machine gun or the VS twin energy bolts?

I'm ruling out the Terran dual 75mms because they travel so slow through the air they are clearly not good at anti - air.

The VS bolts seem to be the fastest but the NC machine gun has a very high RoF so it also seems like it could be good against Reavers and Vultures etc.

Which one do you guys think is better against air units, VS AV BFR or NC AV BFR?

P.S. Yes I realize that each empire has a specific anti-air pilot gun for their BFR, however I'm only concerned with how you guys think the AV weapons compare on their anti-air capabilities?