Halo B's are a lot more reliable feed faster and generally are better, hence why they upgraded them!!
As for feed rate Halo A about 16 bps Halo B 22 bps, now you may think 'I don't hit anywhere near 16 ball in a second' its not about that its the 2 or 3 ball string that you rip out which
is faster then 16 bps.
Hope that helps.
Paul