best this is its open-source, and quite well maintained. Quite versatile support for different hardware emulation and one can add support for their own hardware quite easily. As its also used by virtualization solutions, it needs to fulfill different use cases which has helped in the overall evolution of the QEMU's design. One more good thing is the community is quite active. In case if you find a bug and send a patch for it, they will give it a nice review and will actively work on it so that it gets submitted in time.

- Possibility for emulation and target options - Emulation of target processor and execution capabilities. - Possibility of creating multiple target devices for a virtualization scenario - Lightweight stack compared to other emulation options. -

It has support for almost all architecture, almost complete machine virtualization with system mode QEMU. Very easy to configurable and its development community is very responsive. You can test your first bare metal support and Linux BSP on QEMU first without having actual hardware. QEMU also provide GDB stubs in order to debug the kernel and application workflow. It has various network option to configure with machine, for example User network which is minimal network support inside the QEMU system mode and QEMU bridge network support for real time networking.