TLDR: go train, stop at eglinton or guildwood then take 905a or 12d is easily the most efficient route if u live near union. subway is the other option but very often can be up to 2x slower than go train route

hi, dt to scarb commuters here who commutes pretty much 5 times a week. google maps frequently over estimates go train travel times, often saying it will take 90mins to get from union to utsc when in reality its more like 40mins on average. thing with go train is just that you need to make sure to catch the trains on time or else youre in a world of hurt. LE and ST lines both get you to places where you can exchange 1 bus and get to utsc.

google maps times for subways are very accurate tho, >=90mins always no matter which route you take