Comparing The Diono Radian 3RXT Vs Britax Allegiance is like comparing apples and oranges. The 3RXT is an All-In-One seat that you can use until your child won’t need a car seat anymore while outgrowing the Allegiance would need you to purchase a booster seat afterward.

Let’s see why the Diono Radian 3RXT is a better choice.

 

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Vs

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Ideal Use


 

Diono Radian 3RXT Britax Allegiance
Rear-Facing Weight: 5 to 45 pounds 5 to 40 pounds
Rear-Facing Height Limit: Up to 44 inches The head should be 1 inch below the extended headrest
Forward-Facing Weight: 20 to 65 pounds 20 to 65 pounds
Forward-Facing Height Limit: Up to 57 inches Up to 49 inches
Booster Weight Requirement: 50 pounds N/A
Booster Weight Limit: Up to 120 pounds N/A

One of the main reasons why the Diono Radian 3RXT is a whole lot better than the Britax Allegiance is because of its extended rear-facing capacity. The longer a child is seated rear-facing, the better. Between the two, only the Diono Radian 3RXT can achieve that.

As a bonus, the 3RXT is still usable until booster years – way longer than a Britax Allegiance can offer.

Good All-In-One Car Seats


 

Will It Fit In My Car?


 

Diono Radian 3RXT Britax Allegiance
Width 15 inches 18.5 inches
Height 28.5 inches 26 inches
Depth/Length 16 inches 21 inches

The second main reason parents are getting the 3RXT is because of wanting to fit three of them in a row. An angle adjuster* is also helpful in trying to give more legroom for the front passenger.

 

Good 2-Way Car Seats


 

Installation


 

Diono Radian 3RXT Britax Allegiance
Do I need to use a pool noodle/rolled towel? No Yes
Easy To Install Rear-Facing? Relatively
Easy To Install Forward-Facing? Relatively
Easy To Uninstall? Yes

Both seats can be challenging to install. It’s best to refer to the videos in my separate reviews to learn the tips and tricks from the experts.

 

Diono 2020 Radian 3RXT, 4-in-1 Convertible, Extended Rear Facing, 10 Years 1 Car Seat, Fits 3 Across, Slim Fit Design, Black Jet
By
Price: $279.99
(As of: 2021/09/06 9:35 am - Details
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on https://www.amazon.com/ at the time of purchase will apply to the purchase of this product.
)
You save: $50.00 (15%)
7 new from $279.990 used
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Safety


 

Diono Radian 3RXT Britax Allegiance
Country Of Origin: China USA
Steel Frame: Yes
Five-Point Harness? Yes
Side Impact Tested: Yes
Approved For Airplane Use: Yes
Easy To Buckle And Unbuckle? Yes

 

Britax Allegiance 3 Stage Convertible Car Seat | 1 Layer Impact Protection - Rear & Forward Facing - 5 to 65 Pounds, Static
By
Price: $189.99
(As of: 2021/09/05 9:33 pm - Details
×
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on https://www.amazon.com/ at the time of purchase will apply to the purchase of this product.
)
1 new from $189.990 used
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The Seat

Diono Radian 3RXT Britax Allegiance
Is The Material Breathable? Yes
Seat Weight: 27 pounds 19.5 pounds
Machine Washable Cover? Yes No
Roomy? Yes
No-Rethread Harness? No Yes
Comes With An Infant Body Support? Yes Removable pillow only
Easy To Remove Cover? Yes
Expiration 8 years/10 years 7 years
Comes With A Cup Holder? Yes Selected colors from selected sellers only
Shoulder Harness Has Pads? Yes
Leg Straps Has Pads? No

The Britax Allegiance is lighter should you need to bring a car seat with you for air travel. Its seat cover is easily wipeable, but you cannot throw it in a washing machine. Also, it has a no-rethread harness for convenience as your child grows.

The Diono Radian 3RXT seat has a machine-washable cover, comes with an infant body support, expires longer, and is sure to come with a cup holder.

Compare The Price Difference

 

Diono Radian 3RXT

Britax Allegiance

Check The Latest Price*

Check The Latest Price*

 

Conclusion


 

There is an approximately USD 70 price difference between the Diono Radian 3RXT and the Britax Britax Allegiance. The Diono Radian 3RXT is more expensive. Let’s enumerate why.

  1. It has higher rear-facing and forward-facing weight limits.
  2. It can be used as a booster up to 120 pounds.
  3. The height of a child that it can accommodate in the rear-facing mode is one of the major reasons why it sells.
  4. It’s narrow enough to accommodate three in a row.
  5. It has a machine-washable cover.
  6. It comes with an infant body support.
  7. It has a more generous expiration date.
  8. All colors come with a cup holder.

Are the above eight points worth the extra cost? I think yes.

However, trying to save the USD 70 when getting the Britax Allegiance would also give you the following advantages.

  1. It’s way lighter than the Diono 3RXT – a significant factor when you are bringing the seat with you for air travel.
  2. It has a no-rethread harness.
  3. It’s made in the USA.

The first two advantages of the Britax Allegiance over the 3RXT  are definitely something. The Britax Allegiance is also not bad, except that your child will surely outgrow it faster than if you get the Diono Radian 3RXT.

 

If I am to choose between the two, I’d go for the Diono Radian 3RXT.*

 

What Do You Think?

I’d love to know your thoughts in the comments section below!

 

Cheers!

Pitin

 

I'd love to know your thoughts in the comments section below!

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  1. My son just turned 1 and it has been a CRAZY adventure so far. It is completely overwhelming with how many new products/purchases there are to make. It really is a whole new world.

    We bought a Chicco Keyfit before he was born and have really liked that it not only clicks into a carseat pod but the exact seat can click straight into his stroller.

    Now that he is getting bigger he has almost outgrown his Chicco. So it’s time I’ve started to check into those next size up carseats.

    I know that Britax is a reputable brand so I have been checking those out quite a bit. However, I think your review has convinced me to truly consider the Diono. Honestly, I hadn’t even heard of that brand but it looks great.

    I like that the Diono has review-facing abilities. I think that is soooo important. I’ve been really nervous about him facing forward and would feel more comfortable if he could remain rear-facing for a longer period of time.

    1. Hi Andrew,

      Thanks for sharing your thoughts. 🙂

      Anyway, you might have heard of the “Sunshine Kids?” Diono was formerly known as Sunshine Kids. Maybe that’s why you’re not very familiar. 🙂

      Regards,

      Pitin

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