FC Sion played 18 league seasons and cup tournaments in the data, 1966 to 2016. Success weighs every finish by how hard that competition was to win; Efficiency is the share of what the club could have won that it did win; Edge compares that with an average participant (×1.00).
| 915 | Sibenik (Croatia) | 1.9 |
| 916 | SC Cambuur (Netherlands) | 1.9 |
| 917 | Paris FC (France) | 1.9 |
| 918 | FC Sion (Switzerland) | 1.9 |
| 919 | Port Glasgow Athletic (Scotland) | 1.9 |
| 920 | Djurgaardens IF (SWE) | 1.9 |
| 921 | Union Oberschöneweide (Germany) | 1.9 |
More: the world top 200