2) If you have a power outage, your miner running under Windows won't restart when power comes back on 'till you LOG IN MANUALLY (I have yet to see any miner program that could be run a a service).
     LINUX makes it easy to set up so the miner will restart automatically after a power outage.
 IMO the only thing Windows has going for it are that the overclock/fan control programs available for it like Afterburner are a lot better.