you wrote "For me using APC was making my moodle server instable". Please explain what kind of instability? And where have you configured it in moodle? I'm testing APC on UbuntuServer with wordpress and want to put it on my moodle-server, too. (Just installed it with aptitude install php-apc, and a little config on apc.ini / performance +80% in ab-tests).
Why I would choose APC? Because it's a package under ubuntu. I get security-updates And it's easy to install...
It would be nice to hear, how other moodle-admins manage their caches
Hardware and performance
APC or XCache or eAccelerator
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