SMF
6,495 websites

SMF is free to use

http://www.simplemachines.org/

Simple Machines Forum is a free, professional grade software package that allows you to set up your own online community within minutes.

VS

vBulletin 4.x
3,378 websites

vBulletin 4.x costs money

http://www.vbulletin.com

vBulletin is a professional, affordable community forum solution. Thousands of clients, including many industry leading blue chip companies, have chosen vBulletin - It's the ideal choice for any size of community.

Market Share by Top Websites

1 SMF is leading in Top 1M Sites and The Entire Web.

2 vBulletin 4.x is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 SMF has better usage coverage in more websites categories. Including Computers Electronics & Technology, Games, Vehicles, Arts & Entertainment and 19 other categories.

2 vBulletin 4.x is leading in Finance.

Geography

1 SMF is leading in most countries, including United States, Russia, Germany, Thailand and 84 other countries.

2 vBulletin 4.x is leading in Vietnam, Iran, Saudi Arabia, Egypt and 26 other countries.