When comparing phpBB vs XenForo, the Slant community recommends phpBB for most people. In the question“What are the best web forum software packages?” phpBB is ranked 6th while XenForo is ranked 7th. The most important reason people chose phpBB is:
Source code is available on GitHub under GNU General Licence.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open source
Source code is available on GitHub under GNU General Licence.
Pro Premium extensions
There are many great developers creating premium extensions to make it go to the next level. With those premium extensions phpBB goes far beyond any other.
Pro Extensible
Is built to be extensible and flexible.
Pro Huge extension repository
Its the forum software with the most ready to go extension repository.
Pro Stable
Good stability and functionality.
Pro Fast
Works really fast.
Pro Lots of styles and extensions avaible
Pro Extensible
XenForo is built to be the most extensible and flexible community software ever.
Pro Stable, well written, developed by the guys who once made VBulletin 3.x the best commercial forum software at the time
Price is only $140, one of the "cons" claims it runs up to $610 if you by all t he bells & whistles, but scarcely anyone pays more than $140
Cons
Con Outdated look and feel
Even the latest version of the software looks like the typical '90s forums which is now pretty outdated.
Con Slow (phpBB 3.0)
phpBB 3.0 was not optimized for slow connections.
Con Poor community communication
There is a release lifecycle, but it is not adhered to. Migrations and updates cannot be planned.
Con Expensive
140$ for simple use, price can reach 610$ for complete system and service.
Con Closed source
Con Unique SQL system
Only MySQL system.