N1:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<link rel="shortcut icon" href="ico.png" />  
<head> 
<link rel="shortcut icon" href="ico.png" />  
<title><?php wp_title('&laquo;', true, 'right'); ?> <?php bloginfo('name'); ?></title> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
<link href="<?php bloginfo('stylesheet_directory'); ?>/style.css" type="text/css" rel="stylesheet"/> 
<link href="<?php bloginfo('stylesheet_directory'); ?>/images/tabs.css" type="text/css" rel="stylesheet"/> 
<script src="<?php bloginfo('stylesheet_directory'); ?>/js/mootools.v1.11.js" type="text/javascript"></script> 
<script src="<?php bloginfo('stylesheet_directory'); ?>/js/sliding-tabs.js" type="text/javascript"></script>
M2:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
<link rel="shortcut icon" href="ico.png" />  
<title><?php wp_title(''); ?><?php if(wp_title(' ', false)) { echo ' - '; } ?><?php bloginfo('name'); ?></title>

<meta http-equiv="content-type" content="text/html; charset=utf-8" />

<meta http-equiv="content-language" content="tr" />

<link rel="alternate" type="application/atom+xml" title="Atom 0.3" href="<?php bloginfo('atom_url'); ?>" />

<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="<?php bloginfo('rss2_url'); ?>" />

<link rel="alternate" type="text/xml" title="RSS .92" href="<?php bloginfo('rss_url'); ?>" />

<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />

<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); ?>" type="text/css" media="screen" />

 <meta name="video_type" content="application/x-shockwave-flash" />

<?php  wp_head();  ?>

</head>

wordpress için yuarıdaki 2 header.php den hangini önerirsiniz yada fark varmı ıkısı arasında ?