My wife spent a year in China for school, she told me the best food is whatever the rural mothers are putting on the table, none of which resembles "Chinese food" as we know it. As far as Western Chinese goes though, orange chicken and ginger beef all day.
I doubt I will ever visit China due to many reasons but I am curious to try the food there.
Also check out Anthony Bourdain's Layover series generally, and in this case, Taipei in particular. From my personal experience, I can recommend Singapore, which has its own food as well as food from all over Asia, in probably the cleanest city between the Tropic of Cancer and the Tropic of Capricorn.
As for the original question...Szechuan tangerine beef, various dim sum goodies, and this restaurant, now fabulously refitted: https://www.jadedynasty.ca/
General Tso's chicken. I remember the Chinese restaurant in Japan had food that was nothing like Chinese food here in the US. Of course, neither was the Mexican food joint. The Italian food was still Italian food, I guess Italian is just universal.