hi
I've used vbulletin & SMF only but i chose vb only after spending some hours on searching over the net.
I think it was vouched as best forum software for all good reasons. It has awesome interface, very comprehensive set of options and best part it has very old/experienced support and the forums are old enough to capture all kind of support issues.
rest its upto u bro..asthetically i liked smf more but vb has hell lot of admistrative options on offer..