SENIX 144 cc Gas Lawn Mower, vs WORX Nitro 21" Cordless Lawn Mower, Brushless
Updated July 2026 — SENIX 144 cc Gas Lawn Mower, wins on power and weight, WORX Nitro 21" Cordless Lawn Mower, Brushless wins on price and runtime.
The SENIX mower offers robust performance at a lower price, while the WORX provides advanced technology and eco-friendliness.
Why SENIX 144 cc Gas Lawn Mower, is better
Price
SENIX is $125 cheaper than WORX
Power
SENIX has a powerful gas engine
Cutting Width
Both have the same cutting width of 21 inches
Why WORX Nitro 21" Cordless Lawn Mower, Brushless is better
Technology
WORX features advanced brushless motor
Environmental Impact
WORX is cordless and emission-free
Height Adjustment
WORX offers more height settings (7 vs 6)
Overall score
Specifications
| Spec | SENIX 144 cc Gas Lawn Mower, | WORX Nitro 21" Cordless Lawn Mower, Brushless |
|---|---|---|
| Engine Type | Gas | Electric |
| Cutting Height | 1.25-3.75" | 1.5-4" |
| Warranty | 2 Years | 3 Years |
| Mowing Modes | 2-in-1 | 3-in-1 |
| Battery | N/A | 2 x 20V |
Dimension comparison
Overview of the SENIX 144 cc Gas Lawn Mower
The SENIX 144 cc Gas Lawn Mower is a powerful option for those looking to tackle larger mowing tasks efficiently. Priced at $254.99, it is about 17% cheaper than the WORX Nitro, making it a cost-effective choice for homeowners with extensive lawn care needs. This model features a 144 cc 4-cycle engine, which enhances its capability to handle various terrains, from flat yards to rugged slopes.
The mower offers a 21-inch cutting width, which is designed to cover more ground in a single pass compared to smaller mowers. Additionally, it has a unique 2-in-1 functionality that allows for both mulching and side discharge, providing versatility in lawn maintenance. With six adjustable cutting height positions ranging from 1.25 inches to 3.75 inches, users can easily modify the mower's settings to suit different grass types and lengths.
Overview of the WORX Nitro 21" Cordless Lawn Mower
The WORX Nitro 21" Cordless Lawn Mower comes in at a higher price of $379.99, making it about 49% more expensive than the SENIX model. However, it offers advanced technology that may justify the additional cost for many users. This mower is powered by a high-performance brushless motor that delivers 40% more power and 10% longer runtime compared to earlier models, ideal for lawns up to half an acre.
Equipped with aerodeck technology, the WORX mower promotes better airflow during mowing, which enhances cut quality and efficiency. It also features a 3-in-1 functionality for mulching, bagging, and side discharge, allowing users to choose the best option for their lawn care needs. With seven height adjustment settings ranging from 1.5 inches to 4 inches, users can customize the mowing experience for various grass conditions.
Performance Comparison
In terms of performance, the SENIX mower's 144 cc engine provides substantial power for tackling thicker grass and uneven terrain. Its design allows for efficient mowing on slopes and challenging landscapes. The high wheel design, featuring 8-inch front wheels and 11-inch rear wheels, enhances its maneuverability and passability on rugged terrain, making it suitable for diverse lawn conditions.
On the other hand, the WORX Nitro's brushless motor offers a modern alternative to gas-powered mowers, providing consistent power without the emissions and noise associated with traditional engines. The added benefit of Intellicut technology enables the mower to automatically adjust its cutting speed based on grass density, optimizing battery life and performance. This feature can be particularly advantageous for users with varying grass conditions throughout their lawn.
Cutting Width and Height Adjustment
The cutting width of both mowers is the same at 21 inches, allowing for efficient mowing sessions. However, the SENIX mower's six-position height adjustment offers settings from 1.25 inches to 3.75 inches, providing flexibility for users who need to adjust their mowing height based on grass length. This is particularly useful for maintaining a well-kept lawn that requires different heights at different times of the year.
In contrast, the WORX Nitro offers seven height positions ranging from 1.5 inches to 4 inches. While the difference in maximum height is minimal, the additional setting may appeal to users who want more precise control over their cutting height. This level of customization can help in maintaining the health of the grass and achieving the desired lawn aesthetic.
Convenience and Ease of Use
For users valuing ease of use, the SENIX mower comes with a straightforward installation process and a warranty period of two years, offering peace of mind for buyers. The gas mower design does require fuel management, which can be a drawback for some users who prefer maintenance-free options. However, its powerful engine and straightforward controls make it user-friendly for those familiar with gas mowers.
The WORX Nitro shines in the convenience department, especially with its cordless design. It includes two 20V 5.0 Ah batteries that allow for a maximum runtime of up to 50 minutes, making it suitable for mowing larger areas without the hassle of refueling. The fully collapsible handle also allows for easy storage, which is a significant advantage for users with limited garage space. Additionally, the onboard charge-level indicator provides users with real-time updates on battery life, enhancing the mowing experience.
Environmental Impact
When considering environmental impact, the SENIX gas mower emits emissions typical of gas-powered engines, which may concern eco-conscious consumers. While it is powerful and efficient, it lacks the environmental benefits associated with electric mowers. Therefore, users who prioritize sustainability may find the gas option less appealing despite its performance capabilities.
The WORX Nitro, being a cordless electric mower, offers a more environmentally friendly solution. It operates quietly and produces no emissions during use, making it a suitable choice for those looking to reduce their carbon footprint. Furthermore, the use of the same batteries across multiple WORX tools enhances its eco-friendliness, as users can reduce battery waste by utilizing the same power source for various tools.
Which should you buy?
Choosing between the SENIX 144 cc Gas Lawn Mower and the WORX Nitro 21" Cordless Lawn Mower ultimately depends on individual needs and preferences. If you're looking for a more affordable option with robust power for handling rough terrain, the SENIX mower at $254.99 may be the better choice. It excels in performance and has a solid build suitable for diverse mowing conditions.
However, if you prioritize convenience, eco-friendliness, and cutting-edge technology, the WORX Nitro, although pricier at $379.99, offers significant advantages. Its cordless design, advanced motor technology, and flexibility with height adjustments make it an appealing choice for modern homeowners seeking efficiency and ease of use. Ultimately, your decision should align with your lawn care needs and personal values regarding performance versus environmental impact.

