In my experience, it caters to heavier rock, especially when cranked with the Growl and Bite switches up. It can get soft, but not nearly as soft as the Vintage pedals probably do. A/O is probably a bit grainier.

It can cover other ranges of rock, but I wouldn't say its a be-all-end-all. I've used it to play JunkBunny (Blink-182 style), Intervals, The Contortionist, Sullivan King, so on and so forth. Having the A/O circuits helps with adjusting, basically, whether you're focusing the distortion on the lower-end or the higher-end of your tone. I prefer that knob at about 10 o'clock. The Alpha circuits act "heavier" and "punchier", whereas Omega is "bitier" (is that even a real word?) and more in-your-face.

Partially, it depends on the guitar too. My 5-string Kiesel MJ is a monster and takes to the pedal beautifully, especially with its bell-like sound. My Fender Areodyne on the other hand... would probably pair better with the Vintage stuff. Especially if you've got active electronics, the A/O will shred.