For using in the link or controller there isn't much difference. However, 
> if you need to do some logic in your compile, there is no scope in there!
> You can use attr.$observe in places where the scope isn't there, or the 
> wrong scope. (you need to do something in the link function of an 
> transcluded replaced directive with an isolated scope!)
>

Nice to know I didn't even think of it! So I get why and when we should use 
$observe instead of $watch.

However, can this still called "the linking phase" as specified in the doc? 
How could we be more precise in it?

Regards,
LLoyd

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