What counrty has the best Marine Corps?

To base this answer off an objective metric, such as funding, manpower and defined minimum capabilities, the Marine Corps of the United States would hold the title. No other nation maintains a 'force in readiness' by forward deploying a rapid response force in such size and capability within the spectrum of combat. Funding allocated for equipment, training and welfare are second to none. The United States also maintains the largest standing Marine Corps, with over 180,000 active duty Marines.