Alias Vs. Enum?

[Rubn]

Is there a reason for the differences between Enum and Alias? For 
the most part enums are only used for things that have a value, 
but alias is used more for types. But with templates you can get 
around this and you basically get the funcitonality of Enum for 
alias. Oddly enough from the template parameter being "alias".


template valueOf(alias v)
{

}

alias aa = AliasSeq!(10 == 10);
enum  ee = 10 == 10;

alias err = 10 == 10; // error

What are the actually differences here with aa and ee?