Well, openHABian in general is just a set of scripts that can run on any Ubuntu/debian computer.
I would refrain, though, from looking at other SBCs because, in short “the less mainstream the more problems”. Drivers, untested or unavailable packages for different HW architectures, proprietary kernels and Linux distributions, … and you would not win anything of relevance.
Pis ARE stable if you take proper precaution, see my (known) post.
Note that other SBCs use flash memory, too. They are by no means more reliable.
And if a Raspi REALLY is not powerful enough for your use, you can and should consider going for a PC.
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