Based on the research, Prefect 3.x, specifically version 3.4.9, is currently the most stable and recommended version. This is the version you should use if you're starting a new project or considering an upgrade. A few key points about versioning: 1. Prefect follows semantic versioning (MAJOR.MINOR.PATCH) 2. The 3.x series represents the latest major version with significant improvements over 2.x 3. While Prefect 2.x is still maintained, new features and improvements are focused on the 3.x series If you're starting a new project, I strongly recommend using Prefect 3.x as it includes numerous improvements in areas like: - Streamlined deployment processes - Enhanced worker-based execution - Modern deployment patterns - Latest features and bug fixes While version 2.x is still in use by some teams (particularly those with existing deployments), the future of Prefect development is clearly focused on the 3.x series. The latest stable release (3.4.9) includes various enhancements and bug fixes that make it the most robust version to date. Would you like more specific information about any of the improvements in Prefect 3.x or guidance on getting started with the latest version?

Migration Strategy Recommendations: 1. Staged Approach - Start with a small subset of flows - Test thoroughly in a non-production environment - Consider running both versions in parallel during migration 2. Infrastructure First - Set up new work pools before migrating flows - Configure and test workers - Update deployment infrastructure 3. Code Updates - Update deployment scripts first - Modify storage configurations - Update task and flow decorators - Test each component thoroughly 4. Documentation - Review the official migration guide: https://docs-3.prefect.io/v3/how-to-guides/migrate/upgrade-to-prefect-3 - Document your specific migration steps - Update internal documentation Would you like me to elaborate on any of these points or provide more specific examples for any particular aspect of the migration?