Here are some advantages of vps hosting over shared hosting
1> Security : VPS accounts are insulated from each other, minimizing the risk of unauthorized access from hackers as well as other customers. The isolation of your account also minimizes the risk of being impacted by a DoS attack that was intended for someone else.
2> Performance : All resources can be regulated in the VPS environment. One customer can not run away with a large share of the resources. You service will run reliably and predictably.
3> Protected Mail Service : Each VPS account has its own private mail server, filtered by Postini. This eliminates the risk that your mail service will be blacklisted due to abuses of others sharing the same mail service. It also allows you to take your inbox back from the SPAMMERS.
4> Customer Installed Applications : With VPS you have your own partition and root access. You have the ability to install applications that you want. Please note that hosting company provide support for customer installed applications. You also must assume the responsibility to update any applications that you install in the event that a security vulnerability is discovered in the version you install.
5> Growth Path : VPS system allows us to manage your VPS as an image. This means that your entire environment can be restored from backup to any physical server with no changes to your configuration. You can also easily downgrade or upgrade your service with no downtime!