I've always enjoyed going to Pho Dau Bo. It's saddening that the closest one to my place is in Scarborough. But it's okay! I'll make the trip because it's worth it.
I have been to Vietnam, and Pho Dau Bo's food is very close, if not the same, to what I experienced in Saigon and Hanoi. "Authentic" is the word that came to mind. Their pho broth is so tasty and refreshing. So fitting for a cold winter day. Their vermicelli options are also good. I love their fried spring rolls and the grilled meat that come with the vermicelli.
Bottom line is, if you want an original authentic Vietnamese food, Pho Dau Bo is your go to restaurant in Toronto.