Both are important. But if you have quality content and good site structure then off-page works fine. Overall if you want to optimize your website for the google then off-page is more important and should be relevant.
Both are important one activities , and should be used,but which one is better , will not be a good question because everything has it's importance .
both on page off page r important. On page is very important and on page r not work effectively without off page. so u give important both.
From my experience I would like to say that both on page and off page optimization are required. First on page optimization is must to optimize your website internally. After that you should go through off page optimization. Off page is important to increase traffic and also keyword ranking. So both are most required thing in SEO. Thanks.
On pages SEO and of pages SEO both Activities different its simple logic on page and off pages each Activities is impotent so pls don't miss out any field