@arm_aaup2 I started to use Discord because of the crypto world. All cool projects are there. Then I realized some of the groups related to Startups are there as well.
I use Slack for my company and internal reasons (notifications from API, monitoring), and also I have a few private groups there.
So I may say the primary usage is very similar, but I know that Discord is more powerful in terms of web3 and its future, so I keep an eye on it.