I can vouch for relative conveniencethe public transportation option. As a New Yorker, I presume you have no qualms about taking the bus or subway. The TTC system is not as extensive as the MTA, but it's much cleaner and user-friendly. ^ ^

Because the bus is an express to the subway, it's a lot more convenient and punctual than the M60 to LGA, for instance.

I also recommend the TTC day pass. Unfortunately, it is not available for sale at the airport. If you like, I can send you a couple before your trip. PM me if you like.