While I do agree with this, to an extent, Deadwood was able to finish it's run where Carnivale was cut short. I think I'd probably like Carnivale more if we got to spend more time with it like I said above even if it was just for one more season (which Deadwood was only three seasons so it would be even).
Also the casting on Carinvale was probably some of the best I've ever seen for a show and while Deadwood's was great too I'd say Carnivale's blew it out of the water. Same with the setting and props on Carinvale. And yes I'm a dork and notice shit like that lol.
Either way both are great shows.
I got the complete series box set of Deadwood on DVD during cyber Monday a few years ago for $30 which I paid for with my Best Buy rewards certificates so it actually didn't cost me shit lol. Great deal.