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Nike Women's Run Defy Road Running Shoes, vs Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Updated August 2026 — Under Armour Women's Charged Assert 9, Black/White, 8.5 US leads on comfort and breathability.

The Under Armour Women's Charged Assert 9 offers better value and comfort, while the Nike Women's Run Defy Road Running Shoes provide a classic design.

Why Nike Women's Run Defy Road Running Shoes, is better

Price

Nike is slightly cheaper on average.

Design

Nike offers a classic aesthetic.

Durability

Nike has increased rubber for durability.

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

Comfort

Under Armour has a plush step-in feel.

Breathability

Under Armour features a lightweight mesh upper.

Support

Under Armour provides midfoot stability.

Overall score

Nike Women's Run Defy Road Running Shoes,
75
Under Armour Women's Charged Assert 9, Black/White, 8.5 US
85

Specifications

SpecNike Women's Run Defy Road Running Shoes,Under Armour Women's Charged Assert 9, Black/White, 8.5 US
BrandNikeUnder Armour
ModelRun DefyCharged Assert 9
Upper MaterialMeshLightweight Mesh
MidsoleFoamCharged Cushioning
OutsoleWaffleRubber
WeightLightLight

Dimension comparison

Nike Women's Run Defy Road Running Shoes,Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Price Comparison

The Under Armour Women's Charged Assert 9 is priced at $57.95, making it about 17% cheaper than the Nike Women's Run Defy Road Running Shoes, which are priced at $65.00. This price difference may be an essential factor for budget-conscious shoppers looking for quality running shoes. Both products offer competitive pricing within the running shoe category, but the Under Armour option provides a more economical choice without sacrificing features or performance.

Design and Aesthetics

In terms of design, the Nike Women's Run Defy Road Running Shoes feature a sleek white and platinum-black color scheme that appeals to those who prefer a classic look. On the other hand, the Under Armour Women's Charged Assert 9 comes in a black and white combination, catering to a more understated aesthetic. Both shoes are designed to be stylish while providing functionality, but personal preference in color and style may influence a buyer's decision.

Comfort and Fit

The Under Armour Women's Charged Assert 9 is designed with a plush step-in feel, featuring foam padding around the ankle and a molded liner for a soft and comfortable fit. This shoe is particularly suitable for new runners or those who prioritize comfort. Conversely, the Nike Women's Run Defy Road Running Shoes offer a foam midsole that delivers a soft ride, complemented by flex grooves for a cushioned effect during runs. While both shoes focus on comfort, the Under Armour model emphasizes a plush feel, making it potentially more appealing for extended wear.

Breathability

Breathability is a crucial factor in any running shoe. The Under Armour Women's Charged Assert 9 boasts a lightweight mesh upper that enhances airflow, keeping feet cooler during runs and workouts. This feature is especially beneficial for warm-weather activities. In comparison, the Nike Women's Run Defy Road Running Shoes also incorporate mesh in the upper, promoting breathability. While both shoes prioritize ventilation, the Under Armour model specifically highlights its lightweight mesh, which may provide superior airflow for athletes.

Support and Stability

When it comes to support, the Under Armour Women's Charged Assert 9 includes reinforced overlays that improve midfoot stability, helping runners maintain confident strides during various activities. This stability feature is particularly beneficial for those engaging in longer walks or light training. The Nike Women's Run Defy Road Running Shoes focus on flexibility with their waffle outsole, which is designed for durability and traction. While both shoes offer support in different forms, the Under Armour model's emphasis on midfoot stability may appeal more to runners seeking extra support.

Traction and Outsole Performance

The Under Armour Women's Charged Assert 9 features a rubber outsole with a flexible tread pattern designed to enhance traction and natural flexibility on pavement or treadmills. This design is crucial for maintaining grip during runs, especially in varied conditions. The Nike Women's Run Defy, while also built for traction, emphasizes increased rubber at the outsole for improved durability. Both shoes provide solid performance, but the Under Armour model’s focus on a flexible tread may offer better adaptability for diverse running environments.

Sales Rank and Popularity

The Under Armour Women's Charged Assert 9 has a significantly higher sales rank, positioned at 2002 compared to the Nike Women's Run Defy at 11383. This higher ranking suggests that the Under Armour model is more popular among consumers, potentially indicating greater customer satisfaction. While sales rank alone does not determine quality, it does reflect the market's preference, which may influence potential buyers when choosing between these two options.

Which should you buy?

Choosing between the Nike Women's Run Defy Road Running Shoes and the Under Armour Women's Charged Assert 9 ultimately depends on your specific needs and preferences. If you're seeking a more budget-friendly option, the Under Armour model stands out as the cheaper choice at $57.95, along with its focus on breathability and midfoot support. However, if you prefer a classic design and a soft ride, the Nike model may be worth the additional cost. Consider your priorities in comfort, support, and aesthetics to make the best decision for your running lifestyle.