I would generally agree with tommays.
Keeping up with the scrubbing is inconvenient.
But if the mooring is well sheltered, the boat is probably safest from damage there. While it's good to check-up on it as often as possible, there should be no worries about leaving it for weeks at a time, either.
It is a hassle at times to have to row out and back to the boat (assuming no launch service). Not so much when you're heading out or coming back from a sail, but especially when you are visiting to work on the boat. If you only have a few hours to get a job done, it's much easier to be able to step on and off the boat at the dock.
But one nice advantage is that sometimes the mooring is a destination unto itself. If the wind is blowing stink or you just feel like staying put -- you're already there.