What if HMS Warrior had been a two-decker ironclad?

What impact would building HMS Warrior as a two-decker ironclad instead of a frigate have had?

Britain would probably build armored two-deckers for battle alongside frigates for global cruising. Their greater size and gun count could drive different turret arrangements and raise the firepower and speed required of a later Dreadnought.

The patron's question asks how a two-decker Warrior would change naval development. The scenario first requires a stronger French La Gloire, since the historical British frigate already provided a sufficient response to the actual ship. Britain would probably still build large armored frigates for cruising, then also fund two-deckers for the battle fleet. Immediate international politics could remain broadly familiar, with larger differences emerging as turret ships tried to replace two full gun decks. A later Dreadnought would have to surpass an already larger and more heavily armed fleet, potentially requiring bigger guns and greater speed. These are conditional consequences of the proposed design choice, not a description of ships Britain actually built.