Which one of those WWI alternate outcomes that would be resulted into the best possible world?
Here are how I envision those outcomes (please correct me if I'm wrong):
-Early Entente victory
German offensives in the Eastern front were major disasters. Italy declared war on the CP. After much debate, the CP leaderships agreed on an armistice in early 1915.
-Early CP victory
German victory at the First Battle of Marne. Italy declared war on the Entente. Paris captured, and the French government surrendered. Russia, and then Britain, followed the suit afterward and peace treaty was signed in late 1914.
-Late, but the decisive Entente victory
With the reinforcement from United States flowed in, Britain and France decided to decisively end the war, and successfully captured Berlin in early 1919.
-Late, but not so decisive CP victory
United States never entered the war. German all-or-nothing offensive in late 1918 was successful, and all powers immediately agreed on an armistice, due to sheer exhaustion and public unrest at home.