You have to look at the specific unsweetened dark chocolate ingredients, and the specific cocoa powder,

to make a decision

Generally speaking, unsweetened, not fat-free, this point should be noted by the owner.

Cocoa powder is the main factor in the value of dark chocolate.

In this respect, cocoa powder is more utilitarian than dark chocolate, and more utilitarian than unsweetened dark chocolate.

Cocoa butter? It's just a vegetable fat, a more beneficial fat. It can't be compared to cocoa powder. It's just one of the key ingredients in processed chocolate.