Boulder Ridge is older
Copper Creek is pretty new in terms of the interior of the rooms.
If you go with a
DVC rental you'd be getting a kitchenette in both (sink, small fridge, microwave, toaster)
I prefer Copper Creek over Boulder Ridge villas because Copper Creek rooms are in the actual resort, you don't have to walk outside (under cover) to another building that has it's own little lobby.
I loved leaving our room and being able to be in the lobby in less than a minute - getting the refillable mug drinks, being able to quickly grab food at Roaring Fork, being able to be at the main pool very quickly, that was very nice. I love being IN the resort building.
I prefer the aesthetic of the Copper Creek rooms but that's personal preference. I recommend looking up the YouTubers Here with the Ears - they have a bunch of awesome room tour videos, it will help you narrow things down.
I don't know that much about Boulder Ridge except that they are off in their own building, attached to the main building - we went into the Boulder Ridge lobby and it is super cozy.
I don't think you can go wrong.