• Pros:
• Super easy to get started with
• Very lightweight – no one could accuse bbPress of being bloated
• Huge library of third-party extensions because of its popularity
• Has Automattic behind it, so you can be confident it’s not going anywhere
• Cons:
• Its lightweight nature also means that it’s not as customizable as other plugins by default
• The default styling looks a bit dated and basic

from the article
https://herothemes.com/blog/best-wordpress-forum-plugin/