It is very subjective. The rooms are the same size, but decorated and furnished differently. The biggest issue with the studio is that the second bed is a pull out, where you have two real beds in the regular room. The Copper Creek rooms are much newer and more modern, with hard floors and less rustic furnishings. In general the regular rooms have better view options, since they have a chance at unobstructed views of MK fireworks, while Copper Creek rooms face either pool courtyard.
If you go with a regular WL room we’d recommend not spending the extra for Courtyard View, but some feel it is worth it. We have done well with Standard View and balconies that face towards MK.
It is a minor difference overall, since the rooms are in the same building and can just be a few feet from each other. You can’t go wrong.