I haven't looked into exact gemming, but I prefer LBK because it:
A. Has more slots. B. Affinity is only so useful past 40% IMO.
You're still looking at a very high critical rate and they have the exact same attack power. Again, it's kind of a wacky pain for me to work with a different helmet (I've come to be bleh with ROTR since my net is so bad) but you can work with it either way. The 3 slots on the LS helps quite a bit towards gemming in different skills and gives lots of options towards Earplugs/RA since they both have those nice 3 slots gems.
PSN - FelixxFaust | MHFU HR9 | Call me Faust, it's just easier. Americans spend 12 years learning proper english, then butcher it online.