My preference is VG for most any
juice, but I add a little PG of the same or similar flavor to enhance the flavor. VG can be bland and PG can be harsh on the lungs at times. A mixture is the best move. Yes, the Ecopure flavors are expensive. If PG doesn't irritate your lungs, it will give you the most flavor.
I like the Ecopure Toffee. Toffee is one of favorite tastes, along with chocolate. I don't know what flavor is used in the Ecopure English toffee, but I'd bet it's Lorann, Flavorart, or one of the major flavor makers.