I would say there's zero stability difference. Windows Servers and standard Windows desktops ultimately run the same kernel. These days they even run the same userspace desktop (much to the anger of system admins who thought they wouldn't need to deal with the touchscreen style interface of Windows 8).
Ultimately what separates the server from the home edition is the additional features it has, things like:
- Domain hosting for user information like logins.
- Monitoring of client computers connected to it.
- More advanced storage features like volume shadow copy that allows you to "roll back" files which have changed, and data-deduplication so that 10 copies of the same file don't take up additional space over 1 copy.
On the otherhand there are many underhanded downsides to running server software for instance: anti-virus software may refuse to install because they think you bought a server and that means you're made of money and thus should buy the "server" version of their anti-virus package.
In short I would not at all recommend it. Windows 7 and 8 are absolutely rock solid with about the only thing taking them down being faulty hardware or crap drivers, neither of which would be prevented by running the server OS.
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