really, I don't have a fav company.
I do use and like Aspire, Smok, Sigelei and Kanger. I do like some of the clone companies as well. I read reviews on their products to see if i am interested or not in trying something new.
I guess you can say, i don't just use one company alone and not everything put out by a company is good or for me....
Now venders is a different subject, you did not ask about... laughs.....