Every category I can think of where China is near-first there is some international manufacturer that has a better product.
Several areas where there are much higher volumes or outstandingly better value though. Things like automotive lidar, construction assemblys (like double glazed window units), consumer electronics like quadcopters.
How about the thread topic, robot vacuums? I don't think any other country can even compete anymore, I can't think of any top non-Chinese model.
I recently bought a handheld spectrophotometer for work (color assessment). The product from the leading US company (X-Rite) is ~US$15k in my market. I bought the Chinese equivalent for US$3k. Maybe if I needed guaranteed nine 9s of colour accuracy the US product would be worth it, but for 95% of users in the market, the Chinese product is more than fine.