When comparing POP Forums vs PHPBack, the Slant community recommends PHPBack for most people. In the question“What are the best web forum software packages?” PHPBack is ranked 12th while POP Forums is ranked 18th. The most important reason people chose PHPBack is:
It has been already translated to Spanish and they are adding support for more languages.
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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.
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.