Stack height and intended distance. The Peregrine runs lower to the ground — more agile, more responsive on technical terrain, lighter overall. The Xodus Ultra has a higher stack and more cushion, designed for the fatigue management needs of ultra-distance running.
| Distance / Condition | Shoe |
|---|---|
| 5K–marathon trail | Peregrine |
| Ultra distance (50K+) | Xodus Ultra |
| Very technical or boggy terrain | Xodus Ultra |
| Mixed UK trail conditions | Peregrine |
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Source: Saucony trail specifications from saucony.com.