I never use PEG. I use what most vendors sell and what most vapers vape which is a PG/VG blend. PG is not PEG. PG is proplylene glycol which is what hospitals vaporize to deliver inhaled medications.
And no - what you said is not true unless you buy from hardware vendors or shops that ONLY sell 100% PG or 100% VG - then yes - many of those are all the same Chinese juice. But most real juice vendors offer PG/VG blends and all of the best ones make their juice ONSITE and many will customize the juice for you with extra flavor or a choice of PG/VG blends. So if you shop at decent shops you do not get "the same juice"