Head to head
EGO ST1521S vs DeWalt DCST922B
Head-to-head: EGO's 56V Powerload trimmer against DeWalt's 20V Max workhorse.
#1 in our rankings · Best Overall
EGO EGO Power+ ST1521S
Best for: Homeowners with medium to large yards who want gas-level cutting power and hate rewinding trimmer line.
#2 in our rankings · Best for DeWalt Owners
DeWalt DeWalt 20V Max DCST922B
Best for: Existing DeWalt 20V Max battery owners who want a trimmer that shares batteries with their drills and saws.
Our recommendation
Get the EGO ST1521S unless you already own DeWalt 20V Max batteries. The EGO's wider swath, thicker line, and automatic head are objectively better for the work itself; the DeWalt's advantage is purely economic, and only for existing platform owners.
Cutting width and line
The EGO cuts a 15-inch swath with 0.095-inch dual line; the DeWalt cuts 13 inches with 0.080-inch line. On weeds and large lawns, the EGO's extra two inches and thicker line translate to fewer passes and fewer snapped lines.
Line feed system
EGO's Powerload head winds line automatically and Line IQ feeds it as it wears. The DeWalt uses bump feed, which works but requires stopping and tapping the head on the ground every time line shortens.
Platform economics
The DeWalt is sold as a bare tool, making it the cheapest option by far for anyone who already owns 20V Max batteries and a charger. The EGO requires buying into the 56V ARC Lithium platform, a bigger upfront investment that pays back if you add EGO mowers or blowers later.
Choose EGO EGO Power+ ST1521S if…
- You want the widest swath and thickest line in this guide
- Automatic line winding and feeding matters to you
- You are building or own an EGO 56V yard tool collection
Choose DeWalt DeWalt 20V Max DCST922B if…
- You already own DeWalt 20V Max batteries
- You want the lightest capable trimmer for long sessions
- Bump feed does not bother you
Spec-by-spec comparison
| Spec | EGO EGO Power+ ST1521S | DeWalt DeWalt 20V Max DCST922B |
|---|---|---|
| Price tier | Premium | Mid-range |
| Voltage platform | 56V ARC Lithium | 20V Max |
| Cutting swath | 15 inches | 13 inches |
| Line diameter | 0.095 inch dual line | 0.080 inch dual line |
| Line feed | Powerload auto-wind + Line IQ | Bump feed |
| Head type | Bump-feed free, automatic | — |
| Speed control | — | Variable speed trigger |
| Best for | Homeowners with medium to large yards who want gas-level cutting power and hate rewinding trimmer line. | Existing DeWalt 20V Max battery owners who want a trimmer that shares batteries with their drills and saws. |
| Skip if | You are locked into the DeWalt or Milwaukee 20V battery platform, or you trim a small yard where a lighter 12-inch tool is enough. | You need maximum cutting width for large properties, or you prefer automatic line feed over bump feed. |
Strengths and limitations
EGO EGO Power+ ST1521S
Strengths
- Powerload head winds trimmer line automatically, eliminating manual spool rewinding
- Line IQ technology senses the load and feeds the correct line length without bumping
- 15-inch cutting swath with 0.095-inch dual line handles thick grass and weeds
- 56V ARC Lithium platform is shared across EGO blowers, mowers, and hedge trimmers
Limitations
- Heavier and pricier than 20V-class trimmers
- Best performance requires the larger 4.0Ah battery, which adds weight
- Overkill for small yards under a quarter acre
DeWalt DeWalt 20V Max DCST922B
Strengths
- Runs on the 20V Max battery platform, so existing owners can buy the bare tool
- 13-inch cutting swath with 0.080-inch dual line
- Variable speed trigger gives control for trimming versus full-throttle edging
- Lightweight and well balanced for extended use
Limitations
- Bump-feed head requires stopping and bumping to advance line
- Narrower swath than 15-inch class trimmers
- High-drain trimming benefits from a 5.0Ah or larger battery
How they fit the wider field
- EGO EGO Power+ ST1521S: ranked #1 (Best Overall) in The 4 Best String Trimmers of 2026. Read the full EGO EGO Power+ ST1521S review.
- DeWalt DeWalt 20V Max DCST922B: ranked #2 (Best for DeWalt Owners) in The 4 Best String Trimmers of 2026. Read the full DeWalt DeWalt 20V Max DCST922B review.
Neither one quite right? The full rankings cover 10 picks matched to different buyers.
Questions, answered
Which cuts weeds better?
The EGO. Its 56V motor, 15-inch swath, and 0.095-inch line are all specced above the DeWalt's 20V, 13-inch, 0.080-inch configuration.
Which is the better value?
For DeWalt battery owners, the bare-tool DCST922B. For everyone else, the EGO kit delivers more capability per dollar than the DeWalt kit.