When comparing PHPBack vs ElkArte, the Slant community recommends ElkArte for most people. In the question“What are the best web forum software packages?” ElkArte is ranked 5th while PHPBack is ranked 12th. The most important reason people chose ElkArte is:
Elkarte has BadBehaviour and other measures included into the core to protect your forum from spammers.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Multi-language support
It has been already translated to Spanish and they are adding support for more languages.
Pro Easy setup
PHPBack is very easy to setup, all you need is a server with PHP5 and MySQL installed.
Pro Open Source
PHPBack is open source, uses GPLv3 license.
Pro Improved Anti Spam measures
Elkarte has BadBehaviour and other measures included into the core to protect your forum from spammers.
Pro Notification centre
ElkArte has a notification center where you can see mentions, likes, quoted messages and other alerts, all included into the core of the software.
Pro Responsive design
ElkArte comes out of the box with two responsive styles.
Pro Easy to install
Pro Open Source
It is completely free to use and is licensed with an open source BSD-3 clause license.
Pro Integrated video embedding
Integrated video embedding for YouTube, Vimeo, and DailyMotion.
Cons
Con Small community
PHPBack is fairly young (first stable version was releases in July 2015). Currently the community is small, which may make it more difficult to find help/support.
However, the developer is active on the github page and generally responds quickly.
Con Limited themes and extensions
And community is fairly small as it is derived from SMF Forums.