Would more Edinburgh-class cruisers have been a better choice?

Would building more Edinburgh-subclass cruisers have been better than building Crown Colony cruisers?

Yes, for the additional modernization room, but Britain's 8,000-ton treaty commitment prevented that choice.

The larger Edinburgh hull offered more physical room for modernization. Its building and commissioning times were comparable with those of the Crown Colonies. Continuing that design would therefore have had clear advantages. Britain's 8,000-ton treaty commitment prevented it from treating the larger cruiser as a compliant alternative.