No idea what Big Vapor is. If it's a Malaysian store, I know nothing about it. If it's a "name" brand I do not recommend buying anything without knowing what model it really is, whether it is a good and compatible model, and whether you are paying too much
My recommendations in the US are anything in the 510. Ego, Riva etc 510-
threaded line or anything in the KR808D-1 threaded line
Those two threadings are the most supported 3-piece and 2-piece in the US
But Malaysia may be different.