I'm American so here, all I really know is Americanized Chinese food. :p Of that, my favorites are lemon chicken, egg drop soup, chicken lo mein, sweet and sour shrimp and egg roll.
I lived for a while in Canada, though and the Chinese restaurants there make real Chinese food. Unfortunately, Most of what I tried while there wasn't to my taste, probably because I'm so used to our American style Chinese food. There were some things I absolutely loved, though I am not sure how really authentic they are. One place had amazing fried rice, really the best I have ever had, plus the tastiest seasoned chicken wings. Another place had what they called Shanghai style crispy noodles, which I've never found anywhere else and wish I could!