westy,
Man it's really a coinflip for me. I noticed the rating and slope are slightly higher for Cattail, but I tend to play better on that course. I'd say I've probably played each 1/2 dozen times and tend to fare well on both. This is probably my highest score to date, just couldn't get it going.
Layout-wise I definitely prefer the newer one (Cattail). But it's like choosing Pacific Dunes over Bandon Dunes because both courses are excellent. But Cattail has more unique holes and risk/reward opportunities. Devil's Claw is a lot of back-forth in the way it's laid out. Thinking about it, really only 1, 5, 10, 17 and 18 play north-south so it can get kind of redundant.
I went to the inaugural Nationwide event there in 2001. Some guy above the cut line fanned his drive on 18. My father and I saw it go into the crap and went out there to help him. He just gave us a muted "thanks" and punched it out into the fairway. He didn't care nearly as much as we did, he just wanted to get the round over so he could go home.