Well if you sell it as a whole you will get what you sell it for, approximate market value or whatever.
If you sell it as parts you can potentially make a lot more off of it but you will have to
A: Pull it into parts or make sure buyers are aware that they will need to come and take parts off the car.
B: Run the risk off having it sit around for a while whilst you sell off parts, this shouldn't be an issue if you have the space/time to do it all but if you don't then it is something to keep in mind.