Both of countries are going really close by development, I guess the taxation war which is going on between net will just move Blockchain adoption in each of them. But I bet on China, they are more intelligent and not so aggressive like the states.
in a trade competition or now there is a trade war, between China and America, because it is realized that both parties need each other in trade, in terms of blockchain technology will need each other to do each of their trade transactions, so the trade war between China and America, both no one wins, because both will experience destruction. because anyone who wins will still experience destruction too.