Anastrazole is anastrazole, there is no real liquidex... unless you are referring to who came out with it first, then it is the "original" liquidex but I think A had it out before these liquidex vials came out! But, when referring to "real" liquidex pretty much anyone offering it that is legit will have "real" liquidex! The PnP is the same thing just a different mg/ml ratio! As to which is the "original" liquidex I don't know!
It is kind of like when you say I need to make a xerox copy, when in fact xerox is not the actual name of the machine it is a brand name that has been adopted as a substitute for the real name! If someone told me they were going to make a xerox they might have to go across town to actually make a "Xerox" copy when they actually mean a photocopy! Liquidex has taken the name of Anastrazole/Arimidex in a liquid solution so everyone refers to it as liquidex... get my point?
It comes down to whats cheaper and what best fits your needs, unless someone is really cutting the product... which I highly doubt, you will get the same product! One is 1mg/ml and the other is 4mgs/ml usually the 4mg/ml is cheaper at $180 a vial that is alot better deal than the PnP, but 1mg/ml is much easier to dose!