I feel that the Q&A layout is only for very specific goals.  I like the extended layout (collapsed) for most other forums because it allowed for more discussion and interaction.  The Q&A layout is great if your forum revolves around people asking specific questions, rather than looking to start a conversation. 

I haven't publicly launched my forum yet (beta testing with a few members), but I'm using the Q&A layout for bug reports so that others can vote and have some influence on what topics I should prioritize. The rest of my forums are extended layout. 

Do what makes sense to you 🙂 

@VeganOstomy Sure it makes sense. And thanks for the reply.

In my case (a travel site/blog), i think will go with Q & A because ... there are already so many and big forums for general travel chat. Q & A is much less competition.

You can find more info about each layout in wpForo Doc:

https://wpforo.com/docs/root/categories-and-forums/forum-layouts/