I find an interesting observation in these posts. The shooters that have very little or mostly no experience with the 204 recommend the 223.
The shooters that have experience with both unanimously recommend the 204
Personally, I own and shoot both (at least I used to). I rarely shoot my 223 anymore. The only reason that I keep it is that it is a Colt HBar Match Grade AR-15. It is the gun that I hand visitors who want to "pray and spray" with an AR.
But when I want to KILL coyotes, rabbits, crows, p-dogs, stay cats
etc. I'll go to the DPMS AR 204. It is an absolute tack driver and with the factory Federal Premium 39gr. BK rounds it drops coyotes DEAD! The first coyote I shot with that bullet was running away at about 200 yards. I barked...he turned...I shot...and he fell like he had been run over by a locomotive! And nothing moved, not an ear, not his tail, nothing...just dead. The coolest part is I got to see the whole thing right through the scope!
Yep, I own both. I like both. But the 204 is WAY more fun, more accurate, and far better in the wind. As a matter of fact the 39BK loads will fare better in cross winds than the 22-250 in similar "weight for caliber" bullets. But that is subjective and only because of the high BC of the sierra 39gr bullet.
Bottom line: Get the 204 You won't regret it! Just sayin'