Kyle Mizokami has written for The National Interest a comparison of the world's five strongest navies. Those would be the navies of the U.S., China, Russia, the U.K., and Japan.
If you cut your eyeteeth on Douglas Reeman's novels, have read all 15 volumes of Samuel Eliot Morison's History of United States Naval Operations in World War II, and can quote from memory passages of the Hornblower, Bolitho, and Jack Aubrey books, you love naval lore. Mizokami's article is for you.