i prefer sleep mode.
When a mac is put into sleep mode, it's technically in what pc users would call "hibernation"
which means the computer's basically shut down.
or as they call it... "deep sleep?"
QUOTE
Note that unless you have the computer connected to good power protection (UPS) your sleeping Mac risks lightning strikes and possible power interruption that could cause data damage.
Your computer is at risk for damage whenever it is plugged in to power
on or off