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Britax Boulevard ClickTight vs Cybex Sirona S with SensorSafe
Cybex Sirona S with SensorSafe

Both options make for good, if unremarkable, Convertible Car Seats at the $420 budget range. While they should serve reasonably well, you might want to look into some other options at that price point.
If you're still interested in learning more about the Britax Boulevard ClickTight and Cybex Sirona S with SensorSafe, however, we wrote-up what we know about them:
The Britax Boulevard ClickTight was loved by reviewers at Wirecutter (NYTimes), a highly trusted source that performs reliable in-depth testing. It did great in its "The Best Convertible Car Seats" roundup where it was named its "Ranked 3 out of 21", which, in itself, makes it a product worth considering.
As for the Cybex Sirona S with SensorSafe - MadeForMums, a source that conducts reliable hands-on testing, has featured it in its Cybex Sirona S i-Size review roundup. However, it didn't make it to any of the top spots.
We also wanted to do a direct Britax Boulevard ClickTight vs. Cybex Sirona S with SensorSafe review performance comparison, but we, unfortunately, weren't able to find any Britax Boulevard ClickTight review scores.
Finally, we compared the Cybex Sirona S with SensorSafe to other Convertible Car Seats on the market and found that it did much better than its competitors - its review average of 9.4 out of 10 points is considerably higher than the 6.7 review average of Convertible Car Seats in general.
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