question on encapsulating format for a gp pari function

Hello:

I write my gp pari functions as like this

{fun(a)=

my(b);

b=a;

return(b);

}

But recently I noticed that someone who I highly respect writes in this way.

fun(a)=

{

   my(b);

   b=a;

   return(b);

}

What is the preferred way of doing this? Is the second to allow the 
function signatures to be visible?

Randall