In terms of overall strength, was the Bismarck the most powerful battleship in World War II?

No.

In terms of tonnage, the Bismarck can be regarded as the smallest battleship in the world. The SKC-34's 340mm caliber is smaller than that of the same period, and its accuracy makes up for the shortcomings. But its most fatal flaw was its anti-aircraft firepower. Claimed to be the most advanced battleship in the world at the time, it was equipped with the "37 Hands", a 37mm manual bolt-operated anti-aircraft gun. There is also a joke about this - the German anti-aircraft gunner of the Bismarck said: "Because the Swordfish flies too slowly, it can't hit it." In terms of armor, Bismarck's armor can be said to be thick, but it is not as good as other BIG7s of the same period, and its speed is pretty good. It is famous because of its record rather than its overall strength. Thank you for your acceptance