I went from owning lots of NW to owning only a pair of B.Smithi, but I have got a few NW again but only specifics that really interest me. I was just like Cerat, I had only OW and a few NW that either don't have urticating bristles (P.irminia etc.) or don't flick them (A.avic).
I had a really bad experience with the urticating bristles, had a rash all over my body and itched for about 3 weeks straight! The quickest way to start hating NW species lol.
NW are very nice and everything, but I agree with Cerat, OW for the win.