Diono Radian 3RXT Safe+ vs. UPPAbaby Knox: Which is Better? (2024)

Hi there! We're here to help you decide between the Diono Radian 3RXT Safe+ and the UPPAbaby Knox.

Our goal is to provide you with the information you need to feel confident that you're choosing the optimal car seat for your family's needs and budget. Let us know if you have any other questions!

At A Glance

Our Thoughts

The Diono Radian 3RXT Safe Plus and the UPPAbaby Knox are both strong contenders in the convertible car seat market, each offering a unique balance of safety features, functionality, and style.

Starting with safety, the Diono Radian excels with its standout features such as the steel-reinforced frame and EPS foam protection. These features are particularly valuable during side-impacts, offering an additional layer of security. Moreover, it accommodates a wider range of weights, supporting up to 50 pounds in rear-facing mode and 120 pounds in booster mode. This means that your child can stay in the rear-facing configuration longer and transition to booster mode when they are older, compared to the Knox seat, which supports up to 45 pounds in rear-facing mode and doesn't have a booster mode.

When it comes to usability, the Diono's slim design provides a definite edge for families with multiple children or smaller vehicles, as it can comfortably fit three across in most cars. But keep in mind, some parents noted challenges with the Diono car seat's installation and reassembling, especially of the seat cover, which could be a significant factor if the seats need to be removed frequently or cleaned often.

On the other hand, the UPPAbaby Knox draws attention with its premium aesthetics and innovative safety elements, such as the integrated Koroyd technology to absorb crash impact forces. However, the one major setback is its bulkiness. This could become a problem in smaller vehicles, or if there is a need to accommodate multiple car seats. Additionally, installation is often considered challenging, which could be problematic for parents who need to switch the seat between vehicles frequently.

If you're seeking a car seat that offers a balance of top-tier safety features, space efficiency, and long-term usability, the Diono Radian 3RXT Safe Plus is the recommended choice. However, if luxury and style top your list and you have a larger vehicle, the UPPAbaby Knox may be a worthy consideration. What's crucial is to consider your child's size, your vehicle space, and the amount of time and effort you're willing to spend on installing and maintaining the car seat.