✅ Target group
- Vivoactive 5: Fitness all-rounder for everyday use, focussing on health and smartwatch features.
- Forerunner 165: Runners and athletes focussing on training and running statistics.

✅ Design & display
- Vivoactive 5: Amoled touchscreen, elegant look.
- Forerunner 165: AMOLED display, sporty design, 5-button operation plus touchscreen.

✅ Battery life
- Vivoactive 5: Up to 11 days (smartwatch mode).
- Forerunner 165: Up to 11 days (smartwatch mode), up to 19 hours (GPS mode).

✅ Sport & tracking
- Vivoactive 5: Wide range of sports, no multisport.
- Forerunner 165: Focus on running, cycling, swimming, with multisport tracking.

✅ Training functions
- Vivoactive 5: Basic training analyses, Garmin Coach.
- Forerunner 165: Extended training metrics (e.g. recovery time, VO2max, PacePro).

✅ Music
- Both offer integrated music (Spotify, Deezer).

✅ Price & positioning
- Vivoactive 5: Slightly more expensive, as a lifestyle fitness smartwatch.
- Forerunner 165: Less expensive, focus on running and training performance.