What is the best community platform for you to use, e.g. Discord? Slack? WhatsApp?

My team and I are using a Discord server and Notion to collaborate as we build our app. It's basically our entire collaboration/project management stack. To us, Discord was a no-brainer because... we are building a Discord bot. But that detail aside (I know, not a minor detail), we are happy with Discord and we would do it for any other app. Discord has basically all the same features as Slack lick channels, pings, DMs, but it's free and fun to use. It also has tons of personalization settings and little details that we discover each day. It also has a lot of third-party apps/bots to enrich the experience, but again most are free vs over-priced on Slack. I am paying for a Nitro subscription ($10/mo), partly for the features, partly to contribute to the Discord ecosystem, but it's not mandatory or really a must. I personally use Whatsapp for chat and calls/video chats with my family abroad. Although they made progress in this direction with the desktop app and 'communities', they are far from what Discord can provide: it doesn't have channels, bots, integrations, etc.