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Brooks Women’s Glycerin 21 Neutral Running Shoe - vs Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Updated August 2026 — Brooks Women’s Glycerin 21 Neutral Running Shoe - leads on cushioning and fit.

The Brooks Women’s Glycerin 21 offers superior cushioning and support, making it ideal for serious runners, while the Under Armour Women’s Charged Assert 9 is a budget-friendly option for casual use.

Why Brooks Women’s Glycerin 21 Neutral Running Shoe - is better

Cushioning

Brooks features nitrogen-infused DNA Loft v3 cushioning for maximum comfort.

Support

Brooks provides neutral support and a broad platform for stability.

Sales Rank

Brooks is designed for serious runners, enhancing its appeal despite a lower sales rank.

Why Under Armour Women's Charged Assert 9, Black/White, 8.5 US is better

Price

Under Armour is significantly cheaper at $57.95.

Breathability

Under Armour has a lightweight mesh upper for better airflow.

Weight

Under Armour is lighter and more agile for casual workouts.

Overall score

Brooks Women’s Glycerin 21 Neutral Running Shoe -
85
Under Armour Women's Charged Assert 9, Black/White, 8.5 US
70

Specifications

SpecBrooks Women’s Glycerin 21 Neutral Running Shoe -Under Armour Women's Charged Assert 9, Black/White, 8.5 US
BrandBrooksUnder Armour
Current Price$114.95$57.95
Cushion TypeDNA Loft v3Charged Cushioning
Upper MaterialWarp KnitMesh
Support TypeNeutralMidfoot

Dimension comparison

Brooks Women’s Glycerin 21 Neutral Running Shoe -Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Price Comparison

When it comes to pricing, the Under Armour Women's Charged Assert 9 is significantly more affordable than the Brooks Women’s Glycerin 21, coming in at $57.95 compared to $114.95. This makes the Under Armour shoe about 50% cheaper than its Brooks counterpart. The price difference may be a critical factor for budget-conscious consumers, especially those new to running or training who may not want to invest heavily initially. While the Brooks shoe offers advanced cushioning and features, the Under Armour model provides a solid option at a much lower price point.

Comfort and Cushioning

The Brooks Women’s Glycerin 21 excels in comfort and cushioning, featuring super-soft nitrogen-infused DNA Loft v3 cushioning. This design aims to provide runners with maximum comfort for longer distances, making it ideal for serious runners or those prioritizing comfort. In comparison, the Under Armour Women’s Charged Assert 9 also offers a soft cushioned ride, but it is more geared towards newer runners and lighter training. While both shoes focus on comfort, the Brooks shoe is tailored for those seeking an enhanced plush experience, making it more suitable for longer runs.

Support and Stability

Support and stability are crucial for any running shoe, and both models deliver in their own way. The Brooks Women’s Glycerin 21 provides neutral support and a broad platform that stabilizes the foot, promoting smooth transitions during runs. On the other hand, the Under Armour Women’s Charged Assert 9 features reinforced overlays that improve midfoot stability, ensuring that your foot remains centered during various activities. While both shoes have their strengths, the Brooks model appears to be better suited for dedicated runners seeking superior stability over longer distances.

Breathability

Breathability is vital for keeping your feet cool and comfortable during workouts. The Under Armour Women’s Charged Assert 9 shines in this area with its lightweight mesh upper that enhances airflow. This feature makes it an excellent choice for warm-weather activities. Conversely, while the Brooks Women’s Glycerin 21 does have a breathable upper, its main focus is on cushioning and support rather than maximizing airflow. If you prioritize breathability in your running shoes, the Under Armour model may be the better option.

Weight and Flexibility

In terms of weight and flexibility, the Under Armour Women’s Charged Assert 9 is designed to be lightweight, which contributes to its overall agility during workouts. Its flexible tread pattern allows for natural movement on various surfaces. The Brooks Women’s Glycerin 21, while also providing a comfortable fit, is built with a focus on cushioning, which may make it feel heavier in comparison. For those who prefer a lightweight shoe that allows for quick, agile movements, the Under Armour model stands out.

Aesthetic Appeal

Both the Brooks Women’s Glycerin 21 and the Under Armour Women’s Charged Assert 9 have their unique aesthetic appeal. The Brooks model features a sleek design in a black, grey, and white color scheme that exudes a classic running shoe look. The Under Armour model, also in black and white, offers a modern, sporty appearance that may resonate more with a younger audience. Ultimately, the choice between these two shoes may come down to personal style preference.

Bestseller Status

When considering popularity, the Under Armour Women’s Charged Assert 9 has a notable sales rank of 2002, indicating it is widely favored among consumers. In contrast, the Brooks Women’s Glycerin 21 has a sales rank of 29881, suggesting it may not be as mainstream as the Under Armour model. This difference in sales rank could reflect broader consumer preferences for price, style, or brand loyalty, which may influence your purchasing decision.

Which should you buy?

Choosing between the Brooks Women’s Glycerin 21 and the Under Armour Women’s Charged Assert 9 depends largely on your specific needs as a runner. If you prioritize exceptional cushioning, comfort, and stability for long-distance runs, the Brooks model is the better choice despite its higher price of $114.95. However, if you're looking for an affordable, lightweight shoe that provides breathability and is suitable for casual running or workouts, the Under Armour model at $57.95 is a solid pick. Ultimately, your decision should reflect your running habits and budget.