Hello!

There are a number of forum softwares out there.

vBulletin
PhpBB 3
Simple Machines Forum
MyBB
FluxBB
PunBB
Phorum
FUDForum
Vanilla
Drupal Forum
bbPress
Lefora
IceBB
UltraBB

Which one do you prefer? Why?

I will stick to vB, the same as this forum runs on. As it is easy to use and has some great features.

Cheers!