Unión Española played 18 league seasons and cup tournaments in the data, 1971 to 2025. 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).
| 605 | Oxford University (England) | 4.0 |
| 606 | FK Obilic (Serbia) | 4.0 |
| 607 | Catanzaro (Italy) | 4.0 |
| 608 | Unión Española (CHI) | 4.0 |
| 609 | Instituto (Argentina) | 4.0 |
| 610 | Varteks Varazdin (Croatia) | 3.9 |
| 611 | ROC Charleroi (Belgium) | 3.9 |
More: the world top 200