You run AND do another sport — cycling, trail, triathlon. Runna doesn't cover these; CoachUpFit does.
You want the plan to actually adapt to your Garmin data weekly (HRV, training status, recovery). Runna generates a plan upfront and adjusts modestly; CoachUpFit rebuilds the week from your data.
You're an experienced athlete who wants ACWR injury-risk surfacing, automatic race-week tapering, and "why today" explanations as first-class features.
You're a female athlete who wants cycle-aware training as an actual plan input, not just an optional log.
You want explicit Garmin Training Status, Body Battery, HRV interpretation in your training decisions.