I haven't tried gluing bone, but when repairing china (hard, non-porus, demanding of proper alignment, difficult shapes that can't be clamped), the cyanoacrylate adhesives have been a lot better than epoxy. Close fitting parts which can't be clamped are well suited to the cyano glues, much easier to get thin glue lines. Even low viscosity epoxy takes quite a squeeze to get parts close.
I have used both Vital Bond, and both Zap-Ca and Zap-a-Gap both by Pacer Technologies. I haven't noticed any difference. I am certain that Loctite does a range of viscosities and properties, but are a little harder to find (engineering supplies). Zap stuff is carried by some model shops and Axminster.