I was partial to the vBulletin board since I joined the community just as that came into use. I think it used a gamecube theme?

I liked the invision board a lot. I invested a lot of time in the ikonboard and later invision communities back then, and did a fair amount of modding on ours. I always thought it did a good job with the essentials of forum presentation and features. Honestly I don't remember what the big push was to get off it. I'm not sure it was worth it. Invision was the best all around IMO, in terms of software and community.

I put a good bit of work into the phpBB early to try and re-theme it like invision, so kinda happy that got called out. phpBB has always been kind of awkward. If you accept that we had to switch software, I think it was the right choice at the time. phpBB had turned around a major new version and had a pretty bright looking future at that point. In reality it just stagnated instead.

I don't have much to say about myBB. I've been out of the forum business for a while. It seems fine?