nginx rewrites for sitemaps

Any idea what the difference between these two is and which one is the recommended one?

location ~ ([^/]*)sitemap(.*)\.xml$ {
rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;
rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;
}

or

#Yoast sitemap
location ~ ([^/]*)sitemap(.*)\.x(m|s)l$ {
        rewrite ^/sitemap\.xml$ /sitemap_index.xml permanent;
        rewrite ^/([a-z]+)?-?sitemap\.xsl$ /index.php?xsl=$1 last;
        rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;
        rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;}

Yoast recommends the first one though: http://kb.yoast.com/article/63-xml-sitemaps-nginx but I don’t know enough to figure out the difference…

https://wordpress.org/plugins/wordpress-seo/