EBay is a costumer to costumer service while Amazon Snapdeal and Flipkart are business to costumer service .
Services
1) as it is c to c service so more issue generated as compare to b to service
2) care service is good
DELIVERY
If we talking about delivery they perfectly hire outside service as blue dart or delhivery courier companies.
You can trust sellers by see their ratings on the site.
Also have a good desired Alexa ranking.