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

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

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

If you're searching for a car seat that is adaptable to a variety of vehicle sizes, the Diono Radian 3RXT Safe Plus is a fantastic choice. This convertible car seat shines when it comes to safety; its robust set of features includes a steel-reinforced frame and EPS foam designed for side-impact protection. The slim design proves especially practical for families with multiple children, as it allows for the installation of up to three car seats across in most vehicles. However, it's important to note the complexity of installation and reassembly, which some might find significantly challenging. Plus, if your child is on the taller side for their age, it may be worth considering another option, as some parents have noticed size limitations in this regard.

On the other hand, the UPPAbaby Alta offers an accommodating blend of comfort and ease of use for older children transitioning from a forward-facing harness seat to a high-back booster. This model places an emphasis on proper belt positioning to ensure children are kept secure. The use of the manufacturer's rigid LATCH system has been praised by parents for its easy installation. In addition, users have raved about the roomy and padded design of this seat model, noting that it keeps their children comfortable during trips. Although, families with compact vehicles may want to take into consideration the broad base of this seat, which could potentially cramp smaller backseats.

With these factors in mind, both options present excellent utility depending on your needs. If you have a smaller vehicle or multiple younger children, the Diono Radian 3RXT Safe Plus would be a commendable choice due to its slim design and robust safety features. However, the Diono car seat's complexity in installation and reassembly, as well as its noted size limitation for older children, can make it a less attractive option for some families. On the contrary, if your child is older or if you have a larger vehicle, the UPPAbaby Alta could be the perfect fit. This high-back booster seat offers a distinctly spacious and comfortable design, making it ideal for bigger kids on longer journeys. However, the potential shoulder belt slipping issue and wide base may be drawbacks for families with smaller vehicles or who prioritize effortless seat adjustment.