Best way to check if a user is logged in

Hi

i want to give a different result either if a user is logged in or not. 
it is not very sensitive information, i just want to display a little 
icon and link to the editor for that entry.

  There are at least two different ways to handle this:

1. check within the plugin itself and return a different dom:

in _construct:
$perm = bx_permm::getInstance();
if($perm->isLoggedIn()){
     $this->isLoggedIn = true;
}

2. return the whole dom-tree and check within xsl to display the icons:

add php to namespace:
xmlns:php="http://php.net/xsl"

set the variable $username:

<xsl:variable name="username"><xsl:value-of 
select="php:functionString('bx_helpers_perm::getUsername')"/></xsl:variable>

check on the template:
<xsl:choose>
     <xsl:when test="$username != ''">
      <a href="{...}"><img src="myfunkyediticon.png" /></a>
     </xsl:when>
<xsl:otherwise>

which way do you consider smarter or more performant?

Thanks
Alain.

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