Does your team use Slack or Discord?
I used to have a team on Discord and my current team is on Slack. Personally, I love discord but I use it for fun with friends, and it always associates me with gaming or fun. Slack now associates me with work.
Neither, a few years ago we switched from Slack to Discord, and from there to Google Chat.
We use Slack and never really considered using Discord. I think Slack is just more professional and is really easy to integrate teams into.
Slack for work and anything internal for the company Discord for speaking with our early supporters
I use Slack for work as for Discord I use it for casual talk with friends or playing games.