| Price | $170 | $399 |
| Product Announcement Date | APR 2, 2009 | OCT 4, 2011 |
| Actual Availability/Shipping Date | JUN 2009 | JAN-APR 2012 |
| GPS Recording Functionality | Yes | Yes |
| Data Transfer | ANT+ Wireless | ANT+ Wireless |
| Waterproofing | Yes | Yes - 50m |
| Battery Life (GPS) | 20 Hours | 20 Hours |
| Recording Interval | 1s or Smart | 1s or Smart |
| Alerts | Vibrate/Sound/Visual | Vibrate/Sound/Visual |
| Backlight Greatness | Great | Great |
| Ability to download custom apps to unit/device | No | No |
| Acts as daily activity monitor (steps, etc...) | No | No |
Connectivity | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Bluetooth Smart to Phone Uploading | Via Wahoo Fitness Adapter | Via Wahoo Fitness Adapter |
| Phone Notifications to unit (i.e. texts/calls/etc...) | No | No |
| Live Tracking (streaming location to website) | No | No |
| Emergency/SOS Message Notification (from watch to contacts) | No | No |
| Built-in cellular chip (no phone required) | No | No |
Cycling | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Designed for cycling | Yes | Yes |
| Power Meter Capable | Yes | Yes |
| Power Meter Configuration/Calibration Options | Yes | Yes |
| Power Meter TSS/NP/IF | No | Yes |
| Speed/Cadence Sensor Capable | Yes | Yes |
Running | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Designed for running | Yes | Yes |
| Footpod Capable (For treadmills) | Yes | Yes |
| Running Dynamics (vertical oscillation, ground contact time, etc...) | No | No |
| VO2Max Estimation | No | No |
| Race Predictor | No | No |
| Recovery Advisor | No | No |
| Run/Walk Mode | No | Yes |
Swimming | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Designed for swimming | Partial | Yes |
| Openwater swimming mode | Yes | Yes |
| Lap/Indoor Distance Tracking | No | Yes |
| Record HR underwater | No | No |
| Openwater Metrics (Stroke/etc.) | Distance, no stroke | Yes |
| Indoor Metrics (Stroke/etc.) | No | Yes |
| Indoor Drill Mode | No | No |
| Indoor auto-pause feature | No | No |
| Change pool size | No | Yes |
| Indoor Min/Max Pool Lengths | No | 20m/22y to 100y/m |
| Ability to customize data fields | No | Yes |
| Captures per length data - indoors | No | Yes |
| Indoor Alerts | No | Yes |
Triathlon | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Designed for triathlon | Yes | Yes |
| Multisport mode | Yes | Yes |
Workouts | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Create/Follow custom workouts | Yes | Yes |
| On-unit interval Feature | Yes | Yes |
| Training Calendar Functionality | No | Yes |
Functions | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Auto Start/Stop | Yes | Yes |
| Virtual Partner Feature | Yes | Yes |
| Virtual Racer Feature | No | Yes |
| Records PR's - Personal Records (diff than history) | No | No |
| Tidal Tables (Tide Information) | No | No |
| Weather Display (live data) | No | No |
Navigate | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Follow GPS Track (Courses/Waypoints) | Yes | Yes |
| Markers/Waypoint Direction | No | No |
| Routable/Visual Maps (like car GPS) | No | No |
| Back to start | Yes | Yes |
| Impromptu Round Trip Route Creation | No | No |
| Download courses/routes from phone to unit | No | No |
Sensors | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Altimeter Type | GPS | Barometric |
| Compass Type | GPS | GPS |
| Heart Rate Strap Compatible | Yes | Yes |
| ANT+ Heart Rate Strap Capable | Yes | Yes |
| ANT+ Speed/Cadence Capable | Yes | Yes |
| ANT+ Footpod Capable | Yes | Yes |
| ANT+ Power Meter Capable | Yes | Yes |
| ANT+ Remote Control | No | No |
| ANT+ eBike Compatibility | No | No |
| Shimano Di2 Shifting | | No |
| Bluetooth Smart HR Strap Capable | No | No |
| Bluetooth Smart Speed/Cadence Capable | No | No |
| Bluetooth Smart Footpod Capable | No | No |
| Bluetooth Smart Power Meter Capable | No | No |
| Temp Recording (internal sensor) | No | No |
| Temp Recording (external sensor) | No | No |
Software | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | PC Application | GTC/ANT Agent | GTC/ANT Agent |
| Web Application | Garmin Connect | Garmin Connect |
| Phone App | Garmin Fit | iOS/Android |
| Ability to Export Settings | No | No |
Purchase | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Amazon | Link | Link |
DCRainmaker | Garmin Forerunner 310XT | Garmin Forerunner 910XT | | Review Link | Link | Link |