I 'd have to say QUAD. I've read dirt wheels for 15 years and QUAD just seems more fresh.
Plus you get a pull out poster every month of a kick ass quad and girl -nice to decorate the enclosed trailer :beer:
search for Tanya (pin-ups), she's guards my quads when I'm asleep dreaming about her.
http://www.quadmagazine.com/quad
...oh yeah, forgot to mention some really kick ass photos in the zoom section.