I am trying to avoid American-based or American-affiliated airlines, and intend to fly from San Francisco SFO to Buenos Aires EZE. I have contemplated several journeys, namely:

1) San Francisco->Toronto->Buenos Aires (Air Canada)
2) San Francisco->Mexico City->Buenos Aires (Mexicana)
3) San Francisco->Miami->Buenos Aires (LAN Argentina)
4) San Francisco->Miami->Buenos Aires (Aerolíneas Argentinas)

Has anyone flown via any of the above mentioned routes? If not, how are these plans? I am currently favouring Option 1 as of now.