Below is a rough ranking of Boys leagues based on where clubs that have teams in multiple leagues place each of their levels. Its a little tough to rank because US Club soccer leagues after ECNL are sometimes based upon meritless political votes like CPL. It is a bit more complex for the girls side, but similar:
1. DA (USSF)
2. *USL Academy (Pro)
3. ECNL (US Club)
4. National League (USYS)
5. NPL (US Club)
T6. Challenge League (SCYSA)
T6. SCCL (US Club)
T8. PMSL (SCYSA)
T8. SCCL-Premier (US Club)
10. Open League(SCYSA)
*begins 2020
