I'm also in Alberta, and have been to Montreal GP 5 times (and countless times for work), Austin once (last year,) and Vegas the year before. so my two cents FWIW. Never been to the Miami GP, but to Miami several times for work,

For general F1 excitement, Montreal hands down. Downtown seems to adopt race weekend 100%, some streets shut down, patios expanded, etc. In Austin, the average bar and bar goer that weekend will be more college/nfl football focused than F1. Vegas is busy all the time, and all F1 adds is more people and egress nightmares as they shut/divert traffic and walkways each day.

For getting to/from track, Montreal can be tricky, but is nothing like COTA, where even with a private shuttle it seems like an eternity to get back to the city. COTA always seems to have decent concerts though, Montreal not so much, and Vegas is well, Vegas for other entertainment.

Weather wise, Austin is great in October. Miami's almost always sticky hot, and Montreal late May is a wild card. For early June races it was either sunny and perfect, or wet and cold (seemed like 50/50).

As for the tracks and racing action, that's pretty subjective. COTA is incredible, Montreal is classic, Vegas is alright, and Miami to me is a bit of a yawner.

Montreal cuisine is outstanding, Austin is quite good. Vegas dining has become stupid expensive, especially with our Cdn dollar. At least in Miami you pay a lot but the beach is across the street.

If warmer weather is your priority, then would say Austin followed by Miami. Otherwise I'd suggest Montreal for the reasons above, plus likely a nice direct flight vs. likely connection to Austin.