vBulletin - 500KB Index page once the forum structures have been built along with huge themes that are just hideous, adding another 500KB or so.

SMF - Better straight out of the box, in my eyes. More features for organization, layout, and overall simplicity.

The additional security people cry about is pathetic. If someone truly wanted in, and they knew the basics, they'll eventually get in. It's just a matter of time.

bla need new batteries, osk blows.