First of all, root access offers independence from the hosting provider in terms of software. While the hosting provider still manages the server’s hardware, a choice of software is on a user. It’s you, not your hosting provider, who decides when it is the right time to upgrade, for example, cPanel or MariaDB. We cannot say that this freedom is absolute, though, compared to the dedicated hosting plan. If a bare-metal server has hosted hypervisor installed, its OS must be compatible with a guest OS. For instance, if a physical machine runs Linux, it’s impossible to install Windows as a guest OS. A native hypervisor is compatible with any OS. Apart from that limitation (and apart from illegal activities, of course), VPS users can install whatever software they want.
The force driving server virtualization is similar to that which led to the development of time-sharing and multiprogramming in the past. Although the resources are still shared, as under the time-sharing model, virtualization provides a higher level of security, dependent on the type of virtualization used, as the individual virtual servers are mostly isolated from each other and may run their own full-fledged operating system which can be independently rebooted as a virtual instance.
VMware, Microsoft, Parallels, Citrix (Xen Server), IBM (Bluemix), & Red Hat (OpenShift) are all leading in providing enterprise data center solutions based on VPS networks under proprietary software licensing agreements. VPS web hosting plans are considered a performance upgrade between shared hosting and dedicated servers, where elastic web server frameworks like AWS E2 and Kubernetes also make extensive use of VPS/VM partitions in cloud architecture.
With our dedicated servers, you rent an entire server. This is optimal for people that have very high traffic to their websites or need to setup their server in a very specific way. Not everyone needs to have a fully dedicated web server however. If you’re just getting started with your website, you can save quite a bit of money if you rent a small portion of the server. Shared hosting is when you share a portion of the server with other users rather than rent an entire server to yourself.
If you are familiar with hosting control panels, shell commands, and you have basic server administration and troubleshooting skills, then unmanaged VPS is the way to go. Note that while you purchase self managed VPS, you should be capable of managing applications, software, services installed on your VPS. Also, you must know installation/uninstallations, resource monitoring, server performance tweaking and troubleshooting of any technical issues.
VPS ensures that your website continues to run smoothly, regardless of what is happening elsewhere on the server. It also protects your data from multiple sites, giving you a secure piece of virtual real estate to build a website on.
Essentially, here’s the criteria I would use to judge things – if your site is made up of primarily static, HTML-based content, then you probably don’t need a VPS package. However, if you have a large amount of files stored, multiple sites, dynamic content, and the possibility of major traffic from time to time, then you might consider upgrading to a VPS. It’s a powerful package that allows you to do more than you could with a shared hosting plan, but requires less investment than a dedicated server.