Love their work the best!
Anyway, I voted for B&M because I can name a whole bunch of their roller coaster. Vek gets a no vote from me because of their Deja Vu fail at SFGA and Mack's representative that I have met was not very nice!
I still probably vote for B&M
I'm also a fan of Arrow. The Loch Ness Monster is still one of my favorites.