We mention Yocto and internal tooling rather than other competitors because they're what we hear most often. We would have loved to include more discussion about why were better than other solutions, but it would have made our post a little unwieldy.
I have a comparison between us and Balena here: https://news.ycombinator.com/item?id=22173350.
What other tools did you have in mind? It'd be great to discuss this more!