I'd throw in Washington and (for very different reasons) LA.
Bashing US cities as a category is pointless, I think. Even third-tier ones have a lot to offer, and cultural and public realm highlights that really do stand out. Despite the Atlantas and Omahas and the deadening sprawl that surrounds every one, there is a deeply ingrained urban tradition and sense of civic pride in many, many US cities that is being comprehensively revived as more people rediscover urban cores.
It doesn't hurt that much of the country boomed at basically the best possible time for architecture and planning, which means there's exceptional building stock waiting to be rediscovered. One example is Baltimore, which despite its many troubles has some fabulously renewed and restored historic neighbourhoods that are simply spectacular.
Toronto is phenomenal, and Canada is lucky enough to have a number of wonderful cities. But that doesn't mean we don't have a lot to learn from our neighbours.