Jeff,
Everyone is right about the trails at Deer Valley, PCMR, and The Canyons. As someone who currently teaches or coaches at all three resorts, mostly on groomed blue terrain no less, each resort brings a slightly different flavor.
Deer Valley has easier blue trails off Flagstaff Mtn. Problem there is that Northside lift gets pretty busy, and so do the trails. Over on Bald Mtn (accessed by Wasatch, Mayflower, and Sultan chairs) the groomed runs (double blue and a couple of groomed black) have much steeper sections, generally broken up by flatter sections. Problem is, everyone skis the groomed at Deer Valley and a lot of their terrain is actually off-piste. So all their narrow blue trails wind up like feeling like super highways.
PCMR has great, long, consistent and WIDE blue runs off of King Con. Same for Motherlode. Best thing about King Con and Motherlode is they are very sheltered from the wind. Some other blue runs on other parts of the mountain, as well, like Silverlode and Thaynes lifts, a little higher up Thaynes Canyon. All these are north facing, so have great snow. And the grooming and food at PCMR is every bit as good as Deer Valley, if not better.
The Canyons is much more spread out. It has a lot of long, easy blue runs that connect the different canyons (hench the name).
Feel free to give me a call if you have any questions, or want a private ski lesson, 435-940-0590. Or just ask a mountain employee when you get here, and check the grooming report.
Mike