Brent-
I have not seen CommonGround, but I adore Front Range golf in general.
On my next trip, I will absolutely play CommonGround.
But if this likely to be your only visit to that area soon or ever, I would think that doubling up anywhere would be a wasted opportunity.
At Murphy Creek, you can see one of the all-time great muni par 5's and face some really fascinating choices, particularly off the tee, throughout.
At Riverdale, you can try to identify, in a very interesting canvas overall, the individual brushstrokes of several -very- different craftsmen, including MR. DYE, mr. dye, and Mr. Doak.
At Green Valley Ranch, you can play "What would the guys on GCA say about that!?!
At Redhawk Ridge, you can play pinball with a golfball and have a ball.
At Fossil Trace, you can do the same while also laughing frequently.
At Fox Hollow, you can play 27 holes that serve as a Cliff's notes of the various styles modern architects have tried around Denver.
At Black Bear (Cabnterberry when I lived there), you can see fantastic use of natural arroyos and, to me, perhaps the best nearby embrace of the "scope" of the high skies and transitional terrain.
At Wellshire, you can pretend you actually see remaining traces of Donald Ross.
At South Suburban, you can play a course called South Suburban and think to yourself "Wow, that deserves a better name than South Suburban."
And there are several more with similarly distinct personalities.
So if you are thinking CommonGround x2 so that you can really learn it and ruminate on it, GREAT!
But if you are considering that just to make certain you don't pick a dud, I'd encourage you to take the risk instead. There is a LOT of good public golf there.
-Scott