It always becomes difficult to decide how the resources like time, money and effort should be used in Search Engine Marketing. This can be determined by studying audience behavior, marketing strategies etc.
Once you decide the amount of money, it becomes somewhat typical to understand how to divide the budget in paid search and organic search.
The key advantage for paid search is that you can get the place you want in search engines like Google, Yahoo and Bing. You have complete control over the advertisement. As campaigns become live very soon, therefore it provides results in a short time. The disadvantage is that it is costly and the advertiser needs to pay money for each and every click whether the person who has clicked on the advertisement has bought something or not.
In organic search activities like SEO, the web owner does not need to pay anything to search engines to place his or her sites in top. He or she may need to pay money to SEO Company for making efforts to place his or her site in top results in Search Engine Result Pages (SERPs). Organic search listings are trusted by users very easily as compare to paid listings.
More traffic is converted into sales through SEO (Search Engine Optimization) as compared to paid campaigns.
Organic search activities require too much hard work and efforts to place a site in top results. The placement of sites in a specific place in search engines can not be guaranteed even by SEO experts.