Historically the pure parfum was always the original version. The eau de toilette for no.5 was composed some years after as a more affordable alternative.
Unfortunately, none of the versions of either no. 5 or no.19 are going to be anywhere near what they were intended to smell like, due to ingredient availability/restrictions/cost. What I smelt in the 80s is quite different from what I smell now, for both 5 and 19, and I'm sure even back then no.5 had changed from what it was when it was first composed.
I'm not sure I understand your objection to Jacques Polges, he was after all, Chanel's official perfumer as well, and the eau de parfum is just as valid a formulation as the eau de toilette.
If you want to test the other versions, I think the EDT is easily available in stores, while the parfum is more or less available as a tester in some stores in Europe/Asia, but not so much in the US. So depending on where you are, you might easily test all formulations. There are also online stores that will sell samples of either concentration.