1. Operating System Compatibility: Vagrant is a tool for building and managing virtual machine environments in a consistent way across different operating systems. It supports Windows, Mac, and Linux platforms, making it versatile for developers working in diverse environments. On the other hand, Xen Orchestra is specifically designed for managing Xen hypervisors, which are primarily used in Linux-based environments. This restricts its compatibility compared to Vagrant.

2. Use Case: Vagrant is ideal for developers and DevOps teams who need to set up and manage development environments quickly and consistently. It focuses on automation and ease of use to streamline the development process. In contrast, Xen Orchestra is tailored more towards system administrators who are managing virtualized infrastructures using Xen hypervisors. It provides advanced features for monitoring, backup, and disaster recovery specific to Xen environments.

3. Community Support: Vagrant has a large and active community that contributes plugins, scripts, and provides support through forums and documentation. This community-driven ecosystem enhances the functionality and flexibility of Vagrant. Xen Orchestra, while having a dedicated user base, may not have the same level of community support and resources available as Vagrant, potentially limiting its scalability and customization options.

4. Cost: Vagrant is an open-source project, making it free to use for individuals and organizations. There are no licensing fees associated with using Vagrant, which can be advantageous for budget-conscious users. Xen Orchestra, on the other hand, may involve licensing fees for certain advanced features or commercial usage, adding potential costs to the deployment and maintenance of virtualized infrastructure.

5. Virtualization Technology: Vagrant supports multiple virtualization providers such as VirtualBox, VMware, and Hyper-V, giving users the flexibility to choose the technology that best suits their needs. Xen Orchestra, as mentioned earlier, is specifically tailored for Xen hypervisors, limiting the virtualization options available to users. This difference in virtualization technology can impact performance, compatibility, and overall management capabilities.

In Summary, Vagrant and Xen Orchestra differ in operating system compatibility, use case, community support, cost, and virtualization technology, catering to different user bases and requirements.