We get a lot of this question. It's a question with no answer. Better suited for the general chat board. The only possible information we could give you, is what we like. And we all like something different. You're just going to get a slew of opinions with absolutely no hard facts.
But yes, all those places are considered high quality
juice. You could also check out the
review section of the forum to see what people have to say about various vendors and flavors. If you want information on a specific flavor/vendor you can also
request reviews here.
As for PG / VG, to help you decide on a blend think of it this way - PG = Throat Hit, VG = Vapor. Most vapers and suppliers recommend 80%PG and 20%VG for maximum flavor/vapor quality. It's also said that PG carries the flavor better than VG.
But there are many people who use 100% VG either because they like it more, or they are allergic to PG. I've never heard of anyone vaping 100% PG.
Try an 80%PG mix and take it from there, I would say. Adjust accordingly by experience to fit your personal preferences.
Furthermore, there's a very handy little forum called
Pay It Forward, where you can swap flavors and try new ones. Plus the people are pretty pwn.