Having recently traded a Winnebago Journey (about equivalent to the Phaeton of same vintage) on a 2007 CC, I will say there is a measurable difference in overall build quality. As previously noted, there is a difference in chassis (Freightliner vs. Dynomax). From what I have seen looking under the Dynomax chassis I have, it was built to last. Also, the Phaeton will be rear radiator vs the side rad configuration on the CC. If you will always rely on paying others to do most of your maintenance, maybe no issue for you. If you want to do some/most of your own maintenance, the side radiator configuration offers much better access to the engine...belts, filters, hoses, etc. Plus you won't generally have to worry about the rear radiator/cooling pack getting dirty and clogged and requiring periodic cleaning to keep the engine from running hot.
I have done a fair amount of woodworking in my life and the cabinet work/joinery in the CC is outstanding. Even the way things are put together behind the scenes is impressive. The coach is just solidly built.
I also had concerns about buying an 'orphan' coach. However, I have talked to the folks at CC Corp in Oregon for technical assistance and have ordered a few items from them. They are responsive and seem dedicated to providing tech support, parts and service (if you drive to Oregon).
Bottom line IMO you will enjoy either if they meet your needs in terms of floor plan, etc.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.