Out of all the online sites I use Amazon the most. Here is a list of points as to why I rate it high among all available:
The price is comparatively less as compared to other sites.
Delivery is super fast(mostly within 2 days)
If I need to return an item I can choose a date and time of my choice
The item is packed very well and arrives without any damage.
The tracking of a package is very detailed.
Most of the time when I order 3 or 4 items together they all arrive together.
I have never faced any issues with Amazon. I have also returned an item and the money was put in my bank account within 3 days.