Its pretty simple actually.  Basically they both accomplish the same thing.  But the local pref is exactly that.  Local to the AS.  MED values are carried in to the next AS.  But, when an AS receives a MED value it does not propogate that value to other AS's.  Maybe someone else can explain it a little better.     
 
John
 
 
Kristopher B. Climie <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:B5E6AFD0.28AB%kris@climiecc...
> Here is a question I am just going to throw out there:
>
>
> Look at the example below.  Router B has two connections out of its network
> to router D, one through router A and router C.  All are running eBGP.  What
> is the best way to get Router B to use Router C, using the MED or the
> Local_Pref?  Why?
>
>
>
>           <D> -------------- <C>
>            |                            |
>            |                            |
>            |                            |
>           <A>---------------<B>
>
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