"China is estimated by the Federation of American Scientists to have an arsenal of about 260 total warheads as of 2015, which would make it the second smallest nuclear arsenal amongst the five nuclear weapon states acknowledged by the Treaty on the Non-Proliferation of Nuclear Weapons."

"As of 2017, the U.S. has an inventory of 6,800 nuclear warheads; of these, 2,800 are retired and awaiting dismantlement and 4,018 are part of the U.S. stockpile. Of the stockpiled warheads, the U.S. stated in its April 2017 New START declaration that 1,411 are deployed on 673 ICBMs, SLBMs, and strategic bombers."

EDIT: No one wins, it's who loses the least. The whole point of having them is so the other person doesn't use theirs.