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 is the better lawn mower overall, rated 3.8 to 3.6. The PowerSmart 21 in 170cc RWD DB8621S costs $52.46 less ($339.99 vs $392.45).
Senix 21 in 170cc FWD A025054-A
A 3-in-1 self-propelled mower for flat lawns with lots of trees and beds to steer around.
Amazon $392.45$392.45
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
Each factor is scored 0-100 against the same fixed reference points for every self-propelled lawn mower; a clear win is highlighted. How we rank explains each one.
| Factor weight | PowerSmart 21 in 170cc RWD DB8621S | Senix 21 in 170cc FWD A025054-A |
|---|---|---|
| Overall rating | 3.8/5 | 3.6/5 |
| Value 30% | 100 $16.19 per inch of deck ($339.99, 21 in deck) | 95 $18.69 per inch of deck ($392.45, 21 in deck) |
| Deck 20% | 12 21 in deck | 12 21 in deck |
| Power 15% | 62 170 cc engine | 62 170 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 170cc FWD A025054-A | |
|---|---|---|
| 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 | 170 cc |
| Electric start | No | - |
| Build | ||
| Drive | Rear-wheel drive | Front-wheel drive |
| Folds upright | Yes | - |
| Weight | 59 lb | 61.7 lb |
| Warranty | - | 2 years |