I don't have enough voting options:
work computer: I do a restart, leave on so that the archive, backup and update processes can do their thing at night. I do shut off monitor and any peripherals.
home computers: I shut them all down as I don't always know when I'll get back on them. No need to waste (or pay for) electricity that's not being used. Generally they are shut off at night and won't be turned on until the next evening.