You just asked a very broad question. It really depends on a lot of factors, like your budget, your goal, your timetable, the market size for your products, the competitiveness of the keywords and the carrying out of your online marketing strategies.
PPC gives you instant results but SEO is taking time to give results so PPC is good or the instant results but keep it in mind that it gives short term results.
They are both considered to be very useful and being widely used by the global sites admins who are interested in spreading the word about their businesses and sites. PPC solutions like Google AdWords can help generating fast traffic shares for websites, regardless of their organic positions on top search engines because the paid ads will go live a few minuets after funding the accounts and activating the advertising blocks.
SEO on the other hand can be considered as a long-term solution which needs weeks or months of time to generate the expected outcomes. The internet world is so crowded these days and thousands of domains compete with each other in most niches to reach top positions on search sites. It is recommended to use both methods as by doing so, traffic shares of domains will become maximum and visitors will find sites easier.
For Promoting Product which is the best? tell me in detail anyone
Both are very good in promoting any product or services on search engine. These both things comes in search engine marketing which is effective way of getting potential customers from search engine. PPC is good quick respose where as SEO required good amount of time but most effective in getting good output....
If you want to generate traffic instantly then PPc is best method.However SEo results takes some time to show results but we can get benefit from SEO results for long long time.If you have budget then you can use both.
thanks
PPC Versus SEO
SEO Corporation = #1 
Linear Mode
