I know it's not for everyone, but Boulder really is an awesome city. I love Fort Collins too. You have the great plains directly to your east and the rocky mountains right on your west. Denver is a pretty lively city all year round, and that whole area has a ton of outdoor options for each of the four seasons. The weather is surprisingly temperate compared to its reputation. I don't know anything about Oregon, so I can't say that Boulder is a better place to live, but I think it's a great place.
Portland and Denver are close to the same size, and Colorado has a couple million more people than Oregon does. The University of Oregon ranked 79, supposedly dominates it's sole in-state competition (Willamette ranked 113). The University of Colorado is ranked 47, and Sturm in Denver is ranked 77. That seems pretty significant, but I doubt most of the local firms see it that way. Someone ranked in the top 20% at Sturm is probably in a better position than someone ranked in the middle at Colorado.
The chances at getting a job are kind of a crapshoot until you know how well you'll do in school. So you can always make your decision based on tuition costs (slight advantage Oregon), population of the state (advantage Colorado), University Sports (Huge Advantage Oregon and Nike), Professional sports (huge advantage Colorado), or just a coin flip.