The two environments have plenty of overlapping qualities, but most importantly Dedicated Server render greater security, customization and excellent availability. With granular control, you are free to customize hardware components like disk space or RAM and installation of unique operating systems. More substantial computing power (CPUs) and disk space allow Dedicated servers enhanced performance for high amounts of traffic. When uptime and performance are critical to your business Dedicated Servers are second to none for hosting.
A VPS runs its own copy of an operating system (OS), and customers may have superuser-level access to that operating system instance, so they can install almost any software that runs on that OS. For many purposes they are functionally equivalent to a dedicated physical server, and being software-defined, are able to be much more easily created and configured. They are priced much lower than an equivalent physical server. However, as they share the underlying physical hardware with other VPSes, performance may be lower, depending on the workload of any other executing virtual machines.