All depends on condition.
If the C is in good shape, and you do not mind the C-controls, why not? Keep in mind that a newer lens may actually be in worse condition.

Coatings do not matter that much, the difference between the T coating on the older C lens and the T* coating is minimal. Usings a good lens hood does more, and is needed using T* lenses as well as uncoated lenses.

The optical design of the f/5.6 250 mm Sonnar hasn't changed since it first became available for the 1000-series Hasselblads in the mid 1950s. It did not need to, since it was very good to begin with.
And they do indeed all perform equally well. Indistinguishable.