WWI had more advancements in the air and on the ground than WWII did if we put aside nuclear weapons. In the air, the war began with observation planes that were often armed without machine guns and no real purpose-built fighter planes. By the end of the war there were agile fighters with two forward-firing machine guns, tactical bombers dedicated to close support, and strategic bombers that made deep attacks into the enemy rear to damage industry, cities, and military targets. On the ground tanks weren't even in existence before the war began and by the end of the conflict there were hundreds of them.

That's not to say that the development in WWII wasn't breathtaking, but WWI saw the invention of much of how we see modern warfare--tanks and planes dominating the battlefield.

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