It weighs less than half what a P220 weighs. That's a big plus.
I don't know about "more powerful", though. What do you mean by that?
When choosing a CCW, the most important factor is comfort. If you are more comfortable with an auto, get that. If you feel better about a revolver, get that.
As far as what I'd rather carry 100% of the time, I'll choose the Sig. Most police officers feel the same way.