The one you got last is the same as the new
Before they stated "palm" specifically, it was also palm and they've used the same source for over 5 years they state(for palm - The soy is a new source; ADM from the US, the other is probably from indonisia or malaysia where most palm is from).
No matter palm or soy-derived, it's fine. In europe, almost all VG is from rapeseed(non-GMO), btw...
In flavored juices you won't be able to tell a difference in blind-testings... Some VGs, no matter source-feedstock-used, can have a very slight taste difference compared to others, but it's firstly very slight, so you need a good palette to pick it up, and second, you only can tell when
vaping it unflavored...
In short, use whatever you like... As ED themselves state on there site, then the soy offering is the best deal, but use whatever makes you happy... The active element of VG is glycerol, and glycerol is the same no matter which vegetable oil it comes from, and it's 99.7% pure min usually and the rest is water...