What is the definition of winning here? A different trade regime will have winners and losers within both countries. The US economy will probably take less of a hit to GDP than China so on that US would win. In terms of geopolitics, I hear talk about trying to contain China, and the trade war will advance this agenda in the short term.. long term that ship pretty much sailed 30 years ago. All IMHO of course.
Both lose, but the U.S has the buying power, thus the upper hand