Diferrence between "SEO" and "Google Ads"

In fact, both SEO and Google Adwords are for the purpose of the site on top of the search results page. Here is a comparison between SEO and Google Adwords:
+ The cost: If you use Google Adwords service is when your site that users visit through Google, you will have to pay a sum of money for Google. Therefore the number of users accessing your site through Google increases, cost also means that you pay for Google also increased. Currently, the cheapest rates that you have for each user accessing your site through Google is 1000VND / 1 keyword. If each month has 1000 users accessing your site through Google through a keyword search, you'll have to pay for Google 1000.0000 VND (one million) for that keyword, a fee not cheap no. In addition to the popular keywords are also fees to be much higher.
Unlike Google Adwords, although SEO helps your website to be on top of the search page, but fees are charged for SEO services are always fixed no matter how many users visit your site increasing up huge.
Conclusion: For the cost, SEO is more profitable than Google Ads.
+ The prestige of the site: According to some recent studies, up to over 70% web users have not take care to the Ads displayed on Google search pages ,because they know that the Ads use the money to get high rankings rather than reputable site or the content of web pages attractive and have big quaintity of users go on.
With SEO, then your website will be displayed on the top of search pages, not in the area of the Google Ads, and you will believe your site has credibility with content contains many useful information. Then your site will not missing the visitor.
Conclusion: SEO provides credibility for your website more effective than Google Adwords