Chicco KeyFit 35 Infant Car Seat vs Evenflo Sonus Convertible Car Seat
Both made our Best Car Seats for Small Cars shortlist, at #1 and #3. Here's how they differ and who each one suits.
- BuyOnceRight Research Desk
- Updated
- 4 min read
Quick verdict
Choose the Chicco KeyFit 35 Infant Car Seat if you want belt path routing on the shell itself means the seat installs without its base in a rental car. Choose the Evenflo Sonus Convertible Car Seat if you'd rather have light and easy to move between cars. Overall we rank the Chicco KeyFit 35 Infant Car Seat higher: #1 versus #3 in our Best Car Seats for Small Cars list.
Winner overall: Chicco KeyFit 35 Infant Car Seat
Chicco KeyFit 35 Infant Car Seat vs Evenflo Sonus Convertible Car Seat compared
Every difference that matters, in one table.
| Attribute | ||
|---|---|---|
| Our ranking | #1 of 5 in Best Car Seats for Small Cars | #3 of 5 in Best Car Seats for Small Cars |
| Pick label | Shortlisted | |
| Brand | Chicco | Evenflo |
| Key features | Fits infants 4 to 35 pounds; FAA-approved for aircraft use; Belt path routing built into the shell for base-free installs | See full details |
| Biggest strength | Belt path routing on the shell itself means the seat installs without its base in a rental car | Light and easy to move between cars |
| Main trade-off | Heavier carrier than the LiteMax 35, more tiring across a long terminal walk | Fewer padding and convenience features |
| Best for | travel | second cars, grandparents and travel |
Which should you buy?
#1 pick
Choose the Chicco KeyFit 35 Infant Car Seat if…
- Belt path routing on the shell itself means the seat installs without its base in a rental car
- Widely reported as producing a correct install on the first try, useful when rushed at an airport counter
- If you already own this seat at home, bringing the same one keeps install muscle memory consistent
Best for: travel
Prefer the alternative? See the Evenflo Sonus Convertible Car Seat section.
#3 pick
Choose the Evenflo Sonus Convertible Car Seat if…
- Light and easy to move between cars
- Budget price for a convertible seat
- Rear- and forward-facing use
Best for: second cars, grandparents and travel
Prefer the alternative? See the Chicco KeyFit 35 Infant Car Seat section.
Pros and cons of each
Chicco KeyFit 35 Infant Car Seat
Pros
- Belt path routing on the shell itself means the seat installs without its base in a rental car
- Widely reported as producing a correct install on the first try, useful when rushed at an airport counter
- If you already own this seat at home, bringing the same one keeps install muscle memory consistent
Cons
- Heavier carrier than the LiteMax 35, more tiring across a long terminal walk
- Base is not practical to bring along, so travel means base-free belt installs only
- Height limit around 30 inches limits how long it works for an older child
Evenflo Sonus Convertible Car Seat
Pros
- Light and easy to move between cars
- Budget price for a convertible seat
- Rear- and forward-facing use
- Compact enough for smaller back seats
Cons
- Fewer padding and convenience features
- Harness height adjustment requires rethreading
- Less legroom rear-facing than extended-legroom seats
Chicco KeyFit 35 Infant Car Seat vs Evenflo Sonus Convertible Car Seat: common questions
Which is better, the Chicco KeyFit 35 Infant Car Seat or the Evenflo Sonus Convertible Car Seat?
Choose the Chicco KeyFit 35 Infant Car Seat if you want belt path routing on the shell itself means the seat installs without its base in a rental car. Choose the Evenflo Sonus Convertible Car Seat if you'd rather have light and easy to move between cars. Overall we rank the Chicco KeyFit 35 Infant Car Seat higher: #1 versus #3 in our Best Car Seats for Small Cars list.
What is the difference between the Chicco KeyFit 35 Infant Car Seat and the Evenflo Sonus Convertible Car Seat?
The Chicco KeyFit 35 Infant Car Seat stands out because belt path routing on the shell itself means the seat installs without its base in a rental car, while the Evenflo Sonus Convertible Car Seat stands out because light and easy to move between cars. The trade-offs differ too: the Chicco KeyFit 35 Infant Car Seat's main caveat is that heavier carrier than the LiteMax 35, more tiring across a long terminal walk, and the Evenflo Sonus Convertible Car Seat's is that fewer padding and convenience features.
Is the Chicco KeyFit 35 Infant Car Seat worth it over the Evenflo Sonus Convertible Car Seat?
For most buyers, yes: it's our #1 pick. Consider the Evenflo Sonus Convertible Car Seat instead if heavier carrier than the LiteMax 35, more tiring across a long terminal walk is a deal-breaker for you.
Who should buy the Evenflo Sonus Convertible Car Seat instead of the Chicco KeyFit 35 Infant Car Seat?
The Evenflo Sonus Convertible Car Seat suits second cars, grandparents and travel, while the Chicco KeyFit 35 Infant Car Seat is best for travel.