It is important to bear in mind that once the Hyper-V role is enabled through the server administrator, the code of the hypervisor is already configured to start in the space of Windows kernel. Components that operate in the kernel space always have direct access to the hardware, and the same happens with Hyper-V. On the other hand, VMware ESXi uses a completely different approach. The ESXi hypervisor works as an independent ISO file, being a Linux kernel OS.
Both Hyper-V and ESXi are type 1 hypervisors. This means that they run directly on the hardware and their designs can be classified as microkernelizados or monolithic. The unique design differences between these two hypervisors are the location of device drivers and control function.
Learn all the details reading the full article: How the Hyper-V architecture differs from VMware ESXi