As much as some extreme cases for SEO may be flaunted, on average search engine optimization takes a while to have full effect. This can be a few weeks, a few months, even as long as a year to get desired results. Pay per click on the other hand will have results within a day. If you're interested in getting immediate results with a marketing method, PPC is your choice. You'll find out what keywords are more effective much more quickly and can adjust them almost real-time. SEO is better used for a researched keyword list using keywords you know will have desired results.