Discord still has basic usability issues there if you want to, for example, keep your work and personal accounts separate. Slack is really the gold standard because it understands the need for that separation.
It's a pain, in my opinion to switch between accounts in Slack. I've only been able to keep up with one a time, especially on mobile. I realize that is a feature, but I haven't wanted to introduce Slack outside work setting since I didn't think I could keep up.