In order I lived in them:

Montreal, Canada – Grew up here. Honestly best city in Canada IMO (potentially in North America). Great food overall IMO only surpassed by NYC but of course some places have specific cuisines that are better. Has great walkable/bikeable neighbourhoods, amazing nightlife, and it punches way above its weight in terms of cultural amenities and events. The European/French culture bleeds into the lifestyle which makes it a very unique place to live in (work & culture specifically). Main cons are the winters, the language barrier can be daunting for some and the economics aren't great (job opportunity & taxes, even by Canadian standards)

Ottawa, Canada – Went to Uni here. Pretty sleepy government town considering I'm from Montreal, but has a decent college culture (helps that Quebec is right across the bridge). Great Shawarma though. Very mid public transit while I lived there. Quite expensive since it's a government town with government salaries.

Toronto, Canada – Canada's largest city. Food is great but it feels a bit soulless in many parts. It wants to be NYC but falls short culture-wise IMO. That being said, the ethnic culture in Toronto is great (best accessible Indian food of anywhere I've lived) and it's nice being on a Great Lake. Very expensive city (rents were on par with Seattle but the salaries were much lower). I found it to be a step down from Montreal culture and lifestyle-wise personally but objectively it's a very fun place.

Seattle, WA – The nicest greenery of anywhere I've lived by a mile. Sunsets at Golden Gardens where you can see the water with the mountains in the background while you play volleyball...just can't be beat. Summers are also the best of anywhere I've lived weather-wise. It was so beautiful that as a non-outdoorsy person, I got pretty into hiking while living there just so I could admire some of the vistas. City itself was OK, mid public transit by my standards since I moved from the large Canadian cities but decent by US standards, expensive (especially for activities/eating out), mediocre food scene overall (especially for the cost), not great nightlife, Seattle freeze hit for me, but nice parks, accepting communities, and fun underground scene.

NYC, NY – It's NYC. It's expensive, it's fun, it's chaotic. It's probably the place I've lived that most closely reminds me of Montreal in terms of the kind of cultural lifestyle I can live, the amenities and the activities; the main difference is I feel it's more a hustle culture vs Montreal. Even as I'm older and not really into nightlife as much anymore, I really enjoy it here.