PowerSmart 21 in 170cc RWD DB8621S
The cheapest way into a rear wheel drive 3-in-1 gas mower, for sloped lawns on a tight budget. Expect less dealer support than a Toro.
Amazon $339.99$339.99
The PowerSmart 21 in 170cc RWD DB8621S rates 3.8 among self-propelled lawn mowers; the Senix 21 in 144cc 3-in-1 Push AA-M14 rates 3.6 among push ones. The Senix 21 in 144cc 3-in-1 Push AA-M14 costs $10.10 less ($329.89 vs $339.99).
Senix 21 in 144cc 3-in-1 Push AA-M14
#7 in PushFull review
A complete 3-in-1 push mower for small lawns. It is priced close to name brand mowers, so check those first.
Amazon $329.89$329.89
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different drive classes (self-propelled and push), and each is scored against the reference points for its own class, so a rating says how well each does among its own drive peers. How we rank explains each factor.
| Factor weight | PowerSmart 21 in 170cc RWD DB8621S | Senix 21 in 144cc 3-in-1 Push AA-M14 |
|---|---|---|
| Overall rating | 3.8/5 | 3.6/5 |
| Value 30% | 100 $16.19 per inch of deck ($339.99, 21 in deck) | 51 $15.71 per inch of deck ($329.89, 21 in deck) |
| Deck 20% | 12 21 in deck | 100 21 in deck |
| Power 15% | 62 170 cc engine | 30 144 cc engine |
| Cutting modes 15% | 100 3 ways to cut: bag, mulch, side discharge | 100 3 ways to cut: bag, mulch, side discharge |
| Warranty 20% | 50 warranty not published (neutral score used) | 25 2-year warranty |
Specifications
| PowerSmart 21 in 170cc RWD DB8621S | Senix 21 in 144cc 3-in-1 Push AA-M14 | |
|---|---|---|
| Cutting | ||
| Deck width | 21 in | 21 in |
| Deck | Steel | Steel |
| Cutting height | 1.5 to 3.9 in, 6 positions | 1.2 to 3.8 in, 6 positions |
| Bag | Yes | Yes |
| Bag capacity | - | 1.7 bushels |
| Mulch | Yes | Yes |
| Side discharge | Yes | Yes |
| Power | ||
| Power | Gas | Gas |
| Engine or battery | 170 cc | 144 cc |
| Electric start | No | - |
| Build | ||
| Drive | Rear-wheel drive | Push |
| Folds upright | Yes | - |
| Weight | 59 lb | 54.2 lb |
| Warranty | - | 2 years |