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I work primarility with PPC, but Google uses PR for ranking your webpage, which in turn effects where your results are placed within thier natural listings. To obtain better PR, you have to generate incoming links from relevant sites that have a higher PR. This can be an arduous task, and for some, is just not feasible.
I prefer pay per click because the results are quick, and if you are good, you can effectively manage your position within the search.
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