This feature will have the same look on iOS 14 and macOS 11 Big Sur. SideBar in Mail and Photos: Apple brought a new interface look to Mac Apps such as SideBar in Mail and Photos.AirPods Improvements: Apple improved the AirPods feature in macOS Catalina 10.15, but in macOS 11 Big Sur easily you can connect to your Mac without fiddling with the Bluetooth settings.
Now you can use Pinned messages, Memoji, and Group enhancements that come in iOS 14 on macOS 11 Big Sur. According to Apple, privacy improvements to better battery consumption. Now you can use Safari on Big Sur %50 faster than before. I think using VMware and VirtualBox for installing macOS is much suitable. Further, you can install a different operating system like macOS, Linux, Android OS, and even Windows 10 OS. On the other hand, if you don’t have Mac or MacBook you can use your Windows machine to install macOS 11 Big Sur on Windows PC using VMware and VirtualBox.