Victoire CMS is an Open Source CMS built as a Symfony Framework Bundle. In development since 2015 the tool makes use of Doctrine ORM for storage and a lot of other standard components from the Symfony ecosystem.
Joomla! is one of the big three PHP CMSes. Currently it uses only a single component from the Symfony project. Joomla remains a strong contender with a large number of users and extensions.
Being able to adopt into any Full Stack Symfony project
Doctrine ORM a solid data storage choice
Contemporary admin user experience
Large developer and user base
Plenty of ready made extensions available
Tried and tested basic concepts
Not a very known project with limited adoption
Currently dependent on efforts of one agency
Not proven for enterprise grade projects where Symfony Framework shines