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FWIW we recently started using the Yocto-based BalenaOS[0] in our project and have been rather happy with it because we get to focus on developing and running our software and don't have to bother with the low-level hardware stuff too much.
Unfortunately, as we're getting closer to shipping our product, we've realized that Balena seems to be rather cavalier when it comes to respecting software licenses. They offer pre-built .img files and Docker base images but don't provide a comprehensive list of licenses (let alone the source code) of third-party software components anywhere, as this issue[1] attests to. I'm currently talking to one of their customer service representatives and, as of this morning (when they sent me another email), they don't even acknowledge that this is an issue.
Looks like we'll now have to compile this list on our own. :\
[0]: https://www.balena.io/os
[1]: https://github.com/balena-os/meta-balena/issues/1955
What's particularly neat about Buildroot is the support for reproducible builds.
I have an old project for building container images using buildroot ( https://github.com/br-containers/br-containers ) that I need to pick back up soon. Highly reproducible redis server images weighing in at under 10mb, with your choice of libc under it.