workstation: stand-alone level, used in personal desktop system, operating system support
servier: workgroup for the server, operating system support
esxi: Enterprise for server does not require operating system support
workstation, server: Windows is or an application on Linux, you must first install the host operating system to install workstaion or server, before you can install a virtual machine
esxi: is an independent virtual machine can be installed on a bare metal, and then install the virtual machine.
esxi itself is an OS, can be installed directly, no other OS do low-level system, and server and workstation operating systems do require a supported
workstation is for developers to use, performance in general
server is to give enterprise users, performance for workstation has greatly improved
esxi is used for carrier-class business performance is the best