^This.
Chinning is indeed much quicker but chinning annoys me on 07. Used to be much easier on the "normal" version of runescape. I've trained 75-90 range on my pure at NMZ and got like 70-90K xp/hour. I would definitely say NMZ is a good way to train your range with a blowpipe (especially with void) but scales are like 200gp ea right now which is insane. You might actually be better off chinning.
That, however, means you will have to do much more since it is less afkable. Walk around, get the skeletons properly aligned and make trips to the bank and back every hour or so.
In the end, it's really up to you.