I don't purchase by company, I'm strictly about the license.
My main lines are Dark Shadows, Watchmen, and Transformers (both movie and G1). My Watchmen collecting is winding down because there isn't much out there that I don't have. Dark Shadows, because of the rarity of some of the items made for it, will be a long work in progress. Transformers are obviously never ending, but are a lot of fun - they've really brought back the fun of collecting for me, which was on its way out the door last year.
I still have my Sideshow Buffy and X-Files figures and of course my Dark Shadows figures from those days, and some customs, but the lack of line completion (missing main characters) and lack of licenses that I'm passionate about have really turned me away from 1/6th and soured me on companies like Hot Toys. They're just not making licenses I want, and when they do, they don't complete the line (like with Watchmen, two faves missing = Rorschach and Nite Owl).