To shut down or to sleep, what`s better?

what`s better to put it to sleep or shut it down?

Sleeping
Many computer users almost NEVER shut down their computers. There are many positive benefits to this (especially if you're a Mac user). When a Mac goes to sleep, almost every component inside the computer is turned off; what is not turned off is set in a 'low-power mode'. The contents of the RAM and Video RAM are saved, the network ports might still get a little power, and a few other subsystems stay on, but pretty much everything else is off.
On a laptop, this mode uses VERY little battery power - if you're going to use your laptop again within a day or so without the power adaptor plugged in, this could actually save battery power, as shutting down/starting up uses a lot more energy (much more disk access, processor power, etc.). On a desktop, this could save a little energy (thus a few $$$), especially if you put it to sleep a few times a day when you know you won't be using it.
The best advantage to sleeping is that the computer (a) goes to sleep almost immediately, allowing quick transport of a laptop, and no vigilance after clicking 'Shut Down...' on a desktop, and (b) wakes up almost immediately, allowing you to get to work right away.
Shutting Down
Shutting down a computer has a few benefits as well. One is that NO power is being used at all - for laptops, it's best to shut it down if you're not going to use it for a day or two, as it will save a little bit of energy and heat from being wasted in your laptop. On a desktop, you might wish to shut down so that you can transport it, or if you won't use it for a long while.
Also, shutting down completely wipes away the computer's RAM (random access memory), which might have some corrupt/junk data left in it from various things the computer does. It also lets the computer's components cool down. I definitely recommend shutting down at least once a month or so.
However, when you shut down and start up your computer, the hard drive and other components get more wear and tear, and use more energy.
The Verdict
I recommend all Mac users to sleep their computers unless they won't be used for more than a day or two, and all Mac users should shut down their computers at least once a month to clean out all the gibbledygook that collects inside the components.
from: http://homepage.mac.com/geerlingguy/mac_support/mac_help/pages/0018-sleep_or_shu tdown.html

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