I don't like threaded tipped AR barrels. It just adds to the length unless you are planning on a muzzle brake. I also like longer barrels for the free velocity. I like heavy barrels because they don't heat up as fast. My AR 10 friends seem to buy the 1:11 1:12 twist rates. to shoot 175 or 168 gr.
For the cost of the ultra match, why not get Krieger, Pac-nor, lilja stainless 1:11. My most accurate AR is a 24 inch with a match grade stainless fluted 3 pound 8 oz