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I find that MyBB is the best one to work with.

mybb for the win, I love it!!!!

Free: MyBB
Paid: vBulletin

Mybb is way better, you can get plugins and there are so many...

Beats SMF in all ways.

I like MyBB over almost any other free forum making software it just had so much that you can use to customise and mod with it and the large amounts of free plugins for it make it 10 times better.

I prefer MyBB to vBulletin.

MyBB for free, is sooo fast and advanced at the same time.
IPB for paid, I love the social features, the notifications system is awesome

MyBB is my favorite free forum while VB is my favorite payed forum.

I really like XenForo. It's nice, sleek, and the staff is great.

vBulletin vBulletin vBulletin
I just Love this Software, nothing else ;)