I am going to take a shared server. I am going to host media files . So that i am sure it takes more bandwidth. I have select two hosting company. Bluehost and Hostgator. In hostgator they told unlimited bandwidth and in BlueHost 15Mbps bandwidth. So that which one is better. I know there is no Unlimited bandwidth. So that give some idea about 15Mbps bandwidth. Is 15Mbps bandwidth is better than Hostgator's Bandwidth
15mbps is going to most likely be a slower connection. At HG, you should be able to burst to the full port speed of the server, which is at least 100mbps. Bluehost is not going to allow you to use 5TB of bandwidth (roughly 15mbps) and as you say, there is no such thing as unlimited bandwidth. Somewhat a damned if you do, damned if you don't situation. But the connection speed will most likely be better on HG's servers.
Just make sure you keep an close eye on the resource usage (check their preset limit) else you may find DUE invoices or account suspended for over usage with them