@jaybate-1.0 Getting into the WW2 sidebar a bit: Hate to admit it, but the best volume tank of ww2 was the Russian T34. A rude shock to the blitzkrieging Germans in 1941, but only used in penny packet, piecemeal deployment, but almost needing point blank range to kill. All due to the revolutionary sloped armor. The T34 got upgunned to the 85mm from the initial 76mm. Initially the German Tiger tanks with their 88mm gun were superior machines, but overly complex. There were 10 T34s (and Shermans) for every Tiger. I once read a Tiger tank's commander manual, and it had a concentric circle of ranges, outside of which the Tiger could still kill the T34, but the T34s shell couldnt penetrate the Tiger's thicker frontal armor: "Ich kann dich, doch du mich nicht Abschiessen!" (I can get you but you cant get me). Michael Wittman's lone Tiger destroyed an entire Canadian armored column. Western formations were nothing compared to Soviet masses (the Russian steamroller...).
The most competent German tank was the Panther, fast, lighter, a deadly double long 75mm gun, but still overly complex, and a tendency to burn when hit in the rear. Never enough built.
Interestingly, through most of the cold war period til now, the US has actually followed the 'German' philosophy of 'quality beats quantity'. This applies to the M1 Abrams and F14s, F16s, etc, while the Russians have stuck to their 'cheap, effective quantity' plan. Put the Chinese in this same category of cheap quantity.
Congress and the USAF, USN, and USArmy have made a long habit of refusing cheaper simpler hardware that can be made in true quantity, always opting for the more complex, advanced weaponry. Its not like US companies havent tried to produce cost effective hdwe (Northrop F20 fighter is a famous example).
Interestingly, US tanks didnt become qualitatively superior until the M1 Abrams. The Pattons werent subpar, but simply on-par. The superlative German Leopard 2A6 shares some parts with its US Nato ally M1.