I am moving my wordpress site to a new domain

I am moving my wordpress site from mywindows.in to mywindows8.org
(In wordpress I am using non-WWW as my site URL and in Google Webmaster my prefered domain is also set to non-www version.)
For a search engine friendly 301 redirection what should i write in my old domain’s .htaccess file??

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} !mywindows8.org$ [NC]
RewriteRule ^(.*)$ https://mywindows8.org/$1 [L,R=301]

or

Redirect 301 / https://mywindows8.org/