China and the US are really competing tightly in terms of economy and technology even though these two countries are always in conflict, China cannot escape dependence on the US, this is proven by the news that China wants to invite the US to sit down to discuss the increase in tariffs set by Donald Trump.
and if we discuss other countries that have strong economies and technology, Japan is ranked 3rd, I am not surprised because Japan has contributed a lot to the world for their technology (source google)
As it stand today we can say China is ahead of US, but because many people are used to the say that Us is the strongest economy. But China is doing well in every area you can think of, the have the population to sell whatsover they produce in china, that is why they are not bothered about any country that doesn't believe in their products. But for reall china products are the best now, they have really improve in making a good produce.