CYBEX Sirona S vs. Diono Radian 3RXT Safe+: Which is Better? (2024)

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

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

Comparing the CYBEX Sirona S and Diono Radian 3RXT Safe Plus car seats, it's clear both options offer stand-out safety features. The Sirona S leverages SensorSafe technology for enhanced user alert, while both seats come with reinforced steel frames for increased child security during travel.

The Sirona S's game-changing 360° swivel feature affords parents, especially those with back issues or who frequently park in tight spaces, easier child placement. This car seat also boasts adjustable recline options, creating a comfortable environment as your child grows. However, its complex installation process may frustrate some users, and it's notably bulky, potentially congesting smaller vehicles.

On the other hand, the Diono Radian 3RXT Safe Plus, while lacking the swivable feature, provides parents needing to fit multiple car seats a solution with its slim design. This car seat also offers a 12-position adjustable headrest tailored for growing children's comfort. Nevertheless, installation challenges pertain to both the car seat's assembly and cover reinstallation after washes. And while it's suitable for younger children, it's important to note that at a certain age and height, your child may outgrow this seat.

Looking at each car seat's weight and height specifications, the Diono Radian 3RXT Safe Plus offers Forward-Facing configuration up to a higher height limit (57 inches), which may extend its useful lifespan. However, the CYBEX Sirona S can accommodate a greater weight (up to 65 pounds) compared to the Diono car seat (up to 50 pounds) in the Rear-Facing configuration. This means children can stay in the safer, Rear-Facing configuration for longer.

Given the features and relative trade-offs, if your priority leans heavily towards unique convenience and safety features, the CYBEX Sirona S might be your top pick. Parents that appreciate this model's innovative swivel function and don't mind investing time in learning how to install it properly would benefit most.

However, for the practical-minded parent - especially those needing to fit multiple car seats in one row - the Diono Radian 3RXT Safe Plus presents an excellent choice with its slim design. Despite being less user-friendly in terms of installation and cleaning, its space efficiency and robust safety features may appeal to families with more than one child in a car seat.