SPSS (Statistical Package for the Social Sciences) is compatible with multiple operating systems, including Windows, macOS, and Linux. The choice of the best OS for SPSS depends on your specific requirements and preferences:

1. Windows: Windows is a popular choice for running SPSS due to its widespread compatibility, extensive support, and user-friendly interface. Most versions of SPSS are optimized for Windows, and it offers seamless integration with other Windows-based software.

2. macOS: SPSS is also available for macOS, making it suitable for users who prefer Apple