You can more easily adapt in XStudio the set of test and don't need to do much on your CI loop. this is very handy. It also support other CI tools (Bamboo, TeamCity ...).
XQual provides more than 50 drivers to interface with all the automation tools in the market but also an SDK that gives the ability to develop ones own if they have a proprietary framework for instance.
Integrations with external systems (for example Jira) are only one-way. This means that while you can submit bugs which will be tracked by Jira, changes in Jira itself are not fed back to XStudio.
If a project needs to get started with testing ASAP, Meliora Testlab allows users to get to that stage using a "simple workflow" which means that the project and the test cases don't need to be reviewed, simply add test cases and start testing.
Meliora Test Lab has some powerful features which make team collaboration easy and painless. Things like assignments and real-time notifications help a lot when working with teams.
Some configurations, including dashboard configuration are not based on roles, which means that each team member needs to setup the dashboard themselves.
A free, limited Community Edition of Klaros TestManagement is available. Notably, it lacks test documentation, project management, configuration capabilities. A full comparison can be found here.
TestCollab gives users flexibility in choosing their hosting method. They can either choose a self-hosted plan if they want to host the software on their servers or they can choose a hosted plan to host it on the cloud.