WSJF is recommended for prioritizing the Team Backlog.

WSJF (Weighted Shortest Job First) is a prioritization method recommended by SAFe for use at the Program and Portfolio levels, especially for prioritizing Features and Epics. At the Team level, backlog items (Stories) are generally prioritized based on local context, dependencies, and feedback, not through WSJF. “WSJF is the recommended approach for prioritizing the Program Backlog (Features). It is generally not used for the Team Backlog (Stories), which are usually prioritized in collaboration with the Product Owner based on iteration goals, dependencies, and value.” (Source: SAFe 6.0 SPC Guide, "Establishing Team and Technical Agility" module; Team Backlog section.) ===========