Sorry Adami, but I'm here to yell THE WIRE!
I've seen both shows, and Deadwood, while really well done, doesn't hold a candle to The Wire. The Wire has superior characters, superior writing, superior acting, superior setting, superior messages, and its a helluva lot more impressive for its incredible scope and thought provoking in its ambition. Now, with that being said, I realize that all the above are subjective, and little more than my opinion, but I felt the need to put my two cents out there. The above is, also, in no way a slight at Deadwood because if we're being honest, no television show ever created holds a candle to the wire.
As for Deadwood, I love me some Swearengen