If you are an average person who lives in Toronto and takes the TTC to and from work in the downtown, while driving in the evenings and weekends, the Presto Card will be cheaper than any adult metro passes that you can buy.
Paying two $2.80 fares a day 5 days a week on a presto is $29.50 cheaper per month than a full priced adult metro pass, $12.50 cheaper than a max discount VIP metro pass, and also has a tax return advantage over using tokens as Presto charges qualify for transit tax rebates whereas tokens do not.
and it's convinent just in case you need to take transit to the 905 or need to travel to Pearson on the UPX.
Lastly, you can use your rewards credit card to top up your presto card to earn points and the auto reload function means you never need to worry about buying transit passes again. Ever.
Ps if you are lazy like me, the NFC in the presto card is strong enough to scan through a wallet, so you don't even need two hands to pay your fare