I'm not sure. I tend to be drawn to sleek, athletic looking dogs that are medium(ish) in size. Like Belgians, Koolies, Kelpies, Border Collies, Tollers (not the really heavy boned ones though), Vizsla, Dobermans, etc. Something that looks like it's made to run and jump and play and work. That's what I like to live with, as long as they have a good off switch to go with it.
That said, I also am drawn looks wise to a lot of Giant and mastiff types for some reason. Total opposite end of the spectrum, and not sure if I'd actually own any for real, but there is just something about them I like. Like St. Bernards, Leonbergers, Boerboels, etc.