Short answer
Double-sided blades cut on both edges, so you can cut in both directions and work faster on straight runs. Single-sided blades cut on one edge, which is lighter and often easier to control for detailed work and for beginners.
| Feature | Single-sided | Double-sided |
|---|---|---|
| Cutting speed | Slower | Faster |
| Control | Often easier | Needs more practice |
| Weight | Usually lighter | Can be heavier |
| Best for | Detail, beginners, small hedges | Larger hedges, fast cutting |
Check the specification of any model for what it offers; features vary by model. See hedge trimmer blade types.