The amps are the same, eq, pre, power section, tranf. etc, the 2 version, via the foot switch, gives you a extra boost, on ch one. I have both versions, i'm sticking with the 1 version for all my classic rock stuff, i stay on the 2 ch when i need the distortion ( Van Halen, Whitesnake, etc. ) because ch 2 reacts like it's supposed to, full dist. with guitar wide open, cleaning up when you back of the volume, ch 1 it's either for real clean, or mid clean with a pedal engaged.
The 2 version is as good for all the same as above, and the extra boost is a plus, but not a must have, in my opinion.