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New Balance Women's FuelCell Rebel V5 Running vs Under Armour Women's Charged Assert 9, Black/White, 8.5 US

Updated August 2026 — New Balance Women's FuelCell Rebel V5 Running wins on comfort and cushioning, Under Armour Women's Charged Assert 9, Black/White, 8.5 US wins on weight and breathability.

The New Balance Women's FuelCell Rebel V5 offers advanced technology and performance, while the Under Armour Women's Charged Assert 9 provides excellent value and comfort for beginners.

Why New Balance Women's FuelCell Rebel V5 Running is better

Performance

FuelCell technology enhances responsiveness.

Design

Sleek and modern aesthetics.

Weight

Ultra-lightweight for speed.

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

Price

Significantly cheaper option.

Comfort

No break-in period required.

Breathability

Lightweight mesh upper for airflow.

Overall score

New Balance Women's FuelCell Rebel V5 Running
85
Under Armour Women's Charged Assert 9, Black/White, 8.5 US
70

Specifications

SpecNew Balance Women's FuelCell Rebel V5 RunningUnder Armour Women's Charged Assert 9, Black/White, 8.5 US
CushioningFuelCell foamCharged midsole
Upper MaterialFantomFitEngineered mesh
OutsoleLongitudinal podsRubber with tread
SupportUltra-light supportReinforced overlays
Target UserExperienced runnersNew runners

Dimension comparison

New Balance Women's FuelCell Rebel V5 RunningUnder Armour Women's Charged Assert 9, Black/White, 8.5 US

Price Comparison

In terms of pricing, the Under Armour Women's Charged Assert 9 is significantly more economical, priced at $57.95, compared to the New Balance Women's FuelCell Rebel V5, which retails for $144.95. This makes the Under Armour model approximately 60% cheaper than its competitor. For budget-conscious shoppers or those new to running, the Charged Assert 9 presents a compelling option without compromising on essential features. While the FuelCell Rebel V5 may offer advanced technology and design, the price difference is substantial for those who want effective footwear without the high-end cost.

Comfort and Fit

When it comes to comfort, both shoes excel in different areas. The New Balance FuelCell Rebel V5 boasts a propulsive feel thanks to its FuelCell foam, designed to enhance responsiveness during runs. Its FantomFit upper provides ultra-light support, which is ideal for those who prefer a lighter shoe. On the other hand, the Under Armour Charged Assert 9 prioritizes an incredibly comfortable fit, featuring foam padding around the ankle and a molded liner that requires no break-in period. This shoe is especially suited for newcomers to running or those who prioritize comfort during long walks or light training sessions.

Design and Aesthetics

In terms of design, both shoes have distinct aesthetics appealing to different preferences. The New Balance FuelCell Rebel V5 comes in a Linen/Grey Matter/White color scheme, presenting a sleek and modern look. Its race-inspired accents are aimed at those who want to make a fashion statement while running. Conversely, the Under Armour Charged Assert 9, available in a classic Black/White combination, offers a timeless design that pairs well with various athletic outfits. While both shoes are visually appealing, the choice ultimately depends on personal style and preference.

Performance Features

Performance-wise, the New Balance FuelCell Rebel V5 features advanced technology designed for responsiveness and adaptability during various running conditions. The geometric midsole is engineered to extend wider, offering enhanced stability. In contrast, the Under Armour Charged Assert 9 incorporates a Charged midsole, providing balanced impact protection for smoother running experiences, particularly beneficial for newer runners. Both models excel in performance, yet they cater to slightly different needs, with the FuelCell Rebel focusing on speed and agility while the Charged Assert emphasizes comfort and support.

Breathability and Temperature Control

Breathability is a crucial factor for runners, and both shoes incorporate materials designed to keep feet cool during workouts. The Under Armour Charged Assert 9 features a lightweight mesh upper that enhances airflow, making it an excellent choice for warm-weather activities. Meanwhile, the New Balance FuelCell Rebel V5 also includes a streamlined mesh upper, but its primary focus is on providing a lightweight feel with bonded support. While both options excel in breathability, the Under Armour design may provide a slight edge for those who prioritize temperature control during warmer runs.

Weight and Agility

Weight plays a significant role in how a shoe performs, especially for runners looking for agility. The New Balance FuelCell Rebel V5 is engineered to be ultra-lightweight, making it ideal for speed and quick movements. The design facilitates a responsive feel, which is beneficial for runners who thrive on speed and agility. In contrast, the Under Armour Charged Assert 9, while still lightweight, prioritizes cushioning and stability, potentially sacrificing some agility for comfort. Runners focused on performance metrics may prefer the FuelCell Rebel, while those valuing comfort and support might lean towards the Charged Assert.

Price to Performance Ratio

When evaluating the price-to-performance ratio, the Under Armour Charged Assert 9 stands out as an exceptional value for its price of $57.95. Given its solid performance features, including a soft cushioned ride and breathability, it offers great functionality for the cost. Meanwhile, although the New Balance FuelCell Rebel V5 provides advanced technology and superior responsiveness, its higher price tag of $144.95 may not appeal to all consumers. For those looking for a balance between cost and performance, the Charged Assert may be the more sensible investment, especially for beginners.

Which should you buy?

Ultimately, the choice between the New Balance Women's FuelCell Rebel V5 and the Under Armour Women's Charged Assert 9 comes down to individual needs and priorities. If you are a seasoned runner seeking high performance and advanced technology, the FuelCell Rebel V5 may be worth the investment. However, if you are new to running or looking for an affordable, comfortable option, the Charged Assert 9 offers excellent value without compromising quality. Both shoes have their strengths, making them suitable for different types of runners.