Both are the medium to track the activity of your site. Whilst SEO is solely depends on the efforts you have made on your site. So, to improve your SEO first create appealing and quality content. Generate quality backlinks from authority sites. Share your posts with Social Networking sites etc..Are you guys using Google Analytics and Webmaster Tools to improve SEO for your websites or just viewing your websites' analytics? if so, which parts should we focus on to make SEO better?