Organic Ranking (SEO) vs. Sponsored ads (PPC); How to choose?

• Speed: organic ranking can take up to 12 months; sponsored ranking only takes 24 hours;
• Range: organic ranking is only possible for 10-15 keywords; sponsored ranking is possible for thousands of keywords;
• Stability: organic rankings can drop overnight with search algorithm changes; sponsored rankings are guaranteed stable;
• Cost: organic rankings are free; sponsored rankings are paid per click, and can suffer from click fraud;
• Targeting: sponsored rankings can be shown per time of day or per geographic region; organic rankings cannot
• Media: sponsored ads can show rich media like banners and video ads, organic rankings basically only show text (though this is changing with google universal).
• Audience: organic rankings are shown to all people, sponsored ads can be targeted per website (adsense style) and audience demographics (gender, age, income group).