The biggest advantage of Adwords over SEO is that it can give you quicker results. You will have to pay for each of the visits you get from adwords but if your campaigns are profitable you can justify the investment in PPC and meet your business objectives.
Adwords is ideal for startups and new companies that want to get targeted traffic quickly for the purpose of making sales, finding new customers or even for testing their products, procedures, website effectiveness and any other component in their sales or marketing processes.