Rosyth expansion versus Devonport's military lake

Would today's Royal Navy benefit more from the full interwar Rosyth scheme or the postwar Devonport military-lake basin?

The full Rosyth scheme, chiefly because its extra dry docks would improve major-ship and carrier support.

The full interwar Rosyth scheme is preferred because additional dry docks would give the carriers more maintenance space. If that work is concentrated at Rosyth, another dock there would be particularly useful. The proposed Devonport military-lake basin is also considered useful. The preference follows the carrier-maintenance requirement rather than a claim that the other scheme offered no benefit.