Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | DJI - Osmo Action 3 | Sony - HDR-AS300 |
|---|---|---|
| Waterproof depth | 16 m | 60 m |
| Max 4K fps | 120 | 60 |
| Horizon lock | true | false |
| Max video | 4K120 | 4K60 |
Between the Osmo Action 3 and HDR-AS300, the Osmo Action 3 comes out ahead in max 4k fps / horizon lock, while the HDR-AS300 wins on waterproof depth. Overall, the Osmo Action 3 scores 76.5 and the HDR-AS300 scores 65 on our Mars Score.
Which should you buy?
The Osmo Action 3 is the clear pick on raw spec strength, leading by 11.5 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Osmo Action 3 if you care most about max 4k fps / horizon lock. The biggest gaps in its favor are max 4k fps, horizon lock, max video. The single most decisive one: Max 4K fps — 100.00% more. 120 vs 60.
Pick the HDR-AS300 if you care most about waterproof depth. Its strongest claims are waterproof depth. The single most decisive one: Waterproof depth — 275.00% more. 60 m vs 16 m.
Both ship with comparable stabilization, so those specs do not separate the two — focus on the differences below.
Bottom line: the Osmo Action 3 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: DJI - Osmo Action 3 or Sony - HDR-AS300?
DJI - Osmo Action 3 leads the current Mars Score by 11.5 points.The more useful decision is the trade-off behind that result: compare max video, max 4k fps, waterproof depth against the way you will actually use the product.
Choose DJI - Osmo Action 3 if…
DJI - Osmo Action 3 has the measurable edge on max fps 4k, has horizon lock, max video.
Choose Sony - HDR-AS300 if…
Sony - HDR-AS300 has the measurable edge on water depth m.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why DJI - Osmo Action 3 wins
- ▲Max 4K fps — 100.00% more. 120 vs 60.
- ▲Has Horizon lock.
- ▲Max video: 4K120 (vs 4K60).
Why Sony - HDR-AS300 wins
- ▲Waterproof depth — 275.00% more. 60 m vs 16 m.
Spec comparison
Video
| Spec | DJI - Osmo Action 3 | Sony - HDR-AS300 |
|---|---|---|
| Max video | 4K120lead | 4K60 |
| Max 4K fps | 120lead | 60 |
| HDRⓘ | truelead | false |
| Log profileⓘ | false | false |
Stabilization
| Spec | DJI - Osmo Action 3 | Sony - HDR-AS300 |
|---|---|---|
| Horizon lock | truelead | false |
| Stabilization | advanced | advanced |
Durability
| Spec | DJI - Osmo Action 3 | Sony - HDR-AS300 |
|---|---|---|
| Waterproof depth | 16 m | 60 mlead |
| Weight | 145 g | 109 glead |
| Removable lens | false | false |