The other thing that comes to mind is that is an incomplete statement. It doesn't say what it will use more resources than.

* Using a persisted computed column instead: It depends.

* Calculating in a view instead: probably not.

* Calculating in an SP instead: probably not.

* Calculating in the client app instead: probably not. (It may even use less as the client may only need the computed column so there would be less network traffic if the computed column was smaller than the components that make it up.)

What else could it be compared to?