How to read this ranking
The leader, PDL Zurich (Schlieren), showed 192 different free times in 30 days. The median tracked club showed 61. A club near the top releases slots at many hours, so booking by hand still works there. A club near the bottom, or missing, shows few free times: either it fills up the moment bookings open, or it publishes its calendar late. That is where knowing the exact release time makes the difference.