Traveling for work, I still look for the most economical way to get around. Uber is only available in Select and higher services which comes up to $70+ to get from Pearson to downtown. The bus is too slow so I opted for the best option which is the UP Express.
Tickets cost $12 one-way and train leaves every 15 min. You get a treat to a "scenic" route decorated with graffiti all along the track walls. The trains are comfortable and the ride is smooth and you're downtown in less than 30 min with no traffic!