As a founder what is your preference to build a community?

I love to use Slack to build a community of the paid users for Marvin XR. Discord is one of the most happening platforms to build community but I feel like the average users are little younger and professionals (especially if you're B2B) often do not prefer to join there. Is your product B2C or B2B? What kind of platform do you prefer for your target audience to build a community and why?