Omaha's paper advantage narrows against later British cruisers

Did Omaha-class scout cruisers really have a decisive firepower and speed advantage over British C- and D-class cruisers?

They had some advantage, but casemate arcs, weather, and stronger later British designs make it too small to guarantee an efficient victory.

Omaha carried many guns and had a nominal speed advantage, but several weapons sat in casemates with restricted arcs and poor usefulness in heavy weather. Later C-class and D-class cruisers offer more balanced fighting qualities than a simple gun count suggests. Omaha would likely fare better against early C-class ships than against the later vessels. Even a victory could inflict enough damage to require a long repair, showing why tactical success and useful operational outcome are not the same.