Some people feel that they are allergic to PG, others dont like VG much. VG producers more vapour and has a sweeter taste. It can enhance or kill the flavour of the juice.
Many are buying pure VG from boots to cut their commercial juices as it is more economical to buy and easier to obtain than PG.
I feel sick
vaping VG but that seems unusual.
Both PG and VG are generally suitable for
vaping. E-cigs own brand is very good, I like it a lot.
Hope this helps and doesnt confuse you even more! Ultimately its a personal choice. If you are used to PG juice without issue, you might want to buy a cheap bottle of VG from boots and try it before buying a big bottle of commercial eliquid you dont like.