Preferred forum software?

Just curious – what's your favorite forum software? We've all navigated different platforms, from the slick interfaces of Discourse to the classic vibe of phpBB. Each has its perks, but what software makes you think, "Yep, this one's my jam"?

Maybe you love the simplicity of Vanilla or the customization options in XenForo. Whatever it is, I want to know!

I prefer XF cause that's what I'm used to and it's easier to get things off the ground, but that's not dissing other stuff. In fact, a lot of free software can be just as good if DIY work is put in. Anyway, considered other paid software, I haven't tried them as an owner but probably it isn't much different than XF.