I've never tried Slack, uses Teams (and have used IRC and lots of other chat programs). Can someone clearly and concretely explain the differences/benefits of S

I've never tried Slack, uses Teams (and have used IRC and lots of other chat programs). Can someone clearly and concretely explain the differences/benefits of Slack over Teams? Would love to understand. At they moment they feel the same to me, more or less the same as IRC (except for some non-important details, except for maybe Teams integration with the rest of the MS ecosystem and how easy it supposedly is to add "extensions").