The Dell Optiplex 9020 SFF is a powerful laptop masquerading as a desktop computer. Everything works perfectly under Windows (which it was designed for) and only loses access to the internal speaker on macOS. This issue can be fixed by using a Bluetooth adapter and compatible Bluetooth Speaker or the front or rear headphone jacks. If you have limited space in your work area or needs a PC that is easy to travel with, the Dell Optiplex 9020 SFF is a must-have.
There are multiple (4 front sides and the 6 rear sides) USB ports to help with expansion, front and rear headphones and microphone jacks, and an optical drive. The optical drive is similar to those seen in laptops (to keep the form factor small) so it will only eject the tray with the keyboard or menu command but will not inject like other desktop drives so you will have to close it manually with a push.
The 9020 SFF comes with an AMD GPU with a cooling fan and we recommend that you remove the card when using macOS and stick with the Display Port using the Intel HD Graphics 4600 GPU for better stability and resolutions with multiple macOS. If your system comes with the Nvidia GPU, get rid of it since Nvidia GPUs are known to have exploits that need to be patched and patching could cause undesired results with your programs.