You don't seem to have voted though! Choose one and wisely!Japan
Their forces were all suited for the tasks they were expected to fulfil, well trained and combat experienced.
Of the major players.
The RN had the best organisation, logistic infrastructure and was not only the biggest, but the best balanced, its superiority in destroyers and light cruisers being large. It was to suffer from a few doctrinal flaws and an habit of exposing obsolete ships to excessive danger losing old hulls, but also their crews. One should notice that in the 1915 Dardanelles campaign only the allies lost six predreadnoughs sunk, as many as those of the Russian navy that were sunk at Tsushima.
The German army was to remain the most effective among the ground forces up to 1917, but had set goals that were way to ambitious.
You don't seem to have voted though! Choose one and wisely!
A lot of people saying Germany was prepared the most.
But then why did they lose?
Planning wisely(with feasible goals) also counts for competency.
Well they didn't have much that they needed to do past surviving 1914 for the most part. In 1915 they chose when and where to fight and at Verdun they could have pulled back across the Meuse and not given battle. They also had unlimited access to world credit markets and imports, while Germany had none of that. So the French had the training wheels on passed 1914, while the Germans had a flat tire. Plus the French weren't alone, they had the British and Russians backing them up, while the Germans were handcuffed to the corpse that was A-H.My first thought was Germany, but I'm not so sure now. Seeing how it managed to do the heavy lifting on the western front despite being less populated and industrialized then Germany, I think an argument can be made for France.