I'll move this over there-
This is a pretty subjective question and it assumes a rather high degree of consistancy within a given make, so don't look for a single answer.
I have a bunch of NOS 84's from the Sarge; Russian mills (7189), Funkwerks & others. I have a pair of Funkwerks in my Gabriel Voxer right now that just sing! The general consensus is that a good NOS 84 is well worth the investment and frankly, you can gather a few good sets over time and decide for your self.
You'll find the JJ's getting knocked sometimes around here. I have a pair in a GDS S/C kit build that I actually love. It is one of my best sounding and most usuable amps. EI Goldies round out this amp (and you can't forget the role of pre's in the sonic equation.)
Bottom line, let your ears decide. Good luck!