Pretty much everything. But the biggest thing is the coverage because that is most important. A subway can be clean and high tech and etc but means nothing if it doesn't go where you need to go. How does Toronto compare?
https://www.narcity.com/ca/on/toronto/lifestyle/heres-how-tiny-torontos-subway-system-is-compared-to-other-subways-around-the-world
Besides the coverage, if you look at amenities, cleanness, safety, adjusted pricing (per distance), etc you will see that Toronto falls behind in all those other categories.