Depends on what you like - CC has the advantage of being in the main building so if you like to hang there a lot and like that theming you might pick it. If you like a little more peaceful environment, Boulder's separate building and cute lobby offer a more laid-back feel, so you may prefer that.
Personally I like BR more - generally the points are a little cheaper, I like the fact that almost all of the views have no other buildings or rooms - most are either just woods or lake - and it's still a short walk to Geyser Point and the busses, or over to the main building and boat dock when needed.
I'm a big 'view' and privacy guy, so I strongly prefer rooms that don't look towards other rooms or buildings. Boulder Ridge, especially lake view, are great for that - I wish there were dividers between the balconies to other rooms next door, but at least when inside the room all I see is lake and/or trees. At CC, most rooms face Boulder Ridge, or inside towards the other sections of Wilderness Lodge, unless you get lucky.