These are my favorites where I live:
Toronto
Golden Abalone Court (Richmond Hill)
Diamond Banquet (Markham)
Spring Villa (Markham)
Hong Kong
Lei Garden (Several branches, but best in Shatin New Town Plaza IMO)
Fung Shing (Several branches, but the one in Whampoa near I live is the best IMO)
Super Star Seafood (Several branches, quality more or less the same among the various branches)