The thing about the Creedmoor is that it will do most jobs very satisfactorily with very low recoil and, of interest to handloaders, a modicum of powder. It is a much better choice for subsonic loads as well.
The PRC can add about 200fps to what the CM can do. For most purposes, that is a big yawn - the shooter burns more powder, gets more recoil and the same end result. Shooters using factory ammo also get far fewer choices - Midwayusa lists 69 CR ammo options but only 3 for the PRC. There is also a very significant price difference - midwayusa lists CM ammo starting at $12.99 vs PRC ammo starting at $39.99.
Not knocking the PRC and am still considering re-barreling a barrelless Savage 111 action with a match grade, sporter-weight PRC barrel. Will be shooting my 26" CM for the first time later today.
To me it is much like my .257 Roberts versus most of my other rifles - the Roberts gets most jobs done efficiently but for elk I prefer something more, starting with my .280 Rem and 7mm RM.
Neither one is always the best choice - the 'best' depends on the needs/wants/goals/means of the shooter.