How to choose the right tool to support Communities of Practice (CoP)?

Choosing is complex and depends on several parameters:

Are the members in the same organization (same domain, e.g., xxxx.com)?
If in a single organization, does the organization have corporate licenses for tools such as Microsoft 365 or Google Workspace?
Your budget for licenses?
Your preference for an integrated solution (e.g., Microsoft) or a combo (e.g., Slack + Box + Trello…)?
Maturity of the CoP members in using such collaboration tools?
Number of CoPs to support and number of members overall?
Should the CoPs be private ? Could they be visible on the tool to non-members?
Is your IT willing to accept another tool?

Once you know the answers, it is easier to choose among Teams, Slack, Workplace, Workspace, Viva Engage, LinkedIn, Discord, Framateam, mailing list…