Britain or America alone against Japan

Who would have performed better in a one-on-one war against Japan, Britain or the United States?

Either would probably win through superior capacity, but Britain's blockade-oriented plan may have avoided the decisive battle Japan wanted.

Without Pearl Harbor, the Japanese expected an American fleet to cross the Pacific and arrive near the end of its logistics chain, echoing the logic of Tsushima. That advance gave Japan the decisive battle its planning sought. Britain favored a more Anaconda-like economic strategy that relied less on immediately presenting the fleet for such an engagement. American industry could recover from larger early losses, while the British approach might preserve more fleet strength and possibly end the war sooner, but either power retained the capacity advantage needed to prevail eventually.