Which is the best extended warranty company/website for electronic appliances bought online or offline?

Hi
I want to know Which is the best extended warranty company/website for electronic appliances bought online or offline?
Your experience with any of them. when the time came to use it did they help or just gave excuses .
Is it easy to make claim and settle claim. Is 100% cost bear by them.
Should I take warranty offered by flipkart or amazon at the time of purchasing which they add in product cost or take it separately ?
Is there difference in cost in taking it from flipkart amazon vs taking directly from that company.
Etc etc…..