For free (I, too, was tired of the "subscription model" annual upgrade pleas/threats), I really have to try to find a problem with it.
Parallels seems to virtualize Mac OS more smoothly. It works well with most Linuxes I throw at it (have had some issues with Linux Mint and video drivers). I triple boot on my MacBook, but may toss that for using virtualized PCs. Two-way clipboard support just works, and the granular control over the emulated hardware (how many cores, how much RAM, what size drive, etc.) makes it sweet for testing system parameters. It's not quite as nice to configure as Parallels, but once it's running it's fantastic. What can be said has mostly been said, but I'll chime in.
GUI: Fixed a glitch in the log viewer which was causing wrong log file to be saved. Windows hosts: GUI: Fixed missing Qt libraries for vista style and sql driver. Linux Guest Additions: Fixed issue when VBoxClient seamless service caused a crash of some X11 applications. Linux Guest Additions: Introduced initial support for kernel 6.1. Windows host: Shared Clipboard: Fixed issue when only 4Kb of host clipboard buffer was accessible to guest. macOS hosts: Fixed VM crash when the guest tries to access a microphone or webcam. macOS hosts: Re-introduced support for internal networking, this is considered a bit experimental still. 
macOS hosts: Added workaround for a bug in the Hypervisor framework on Catalina causing VERR_NEM_MAP_PAGES_FAILED errors when starting a VM. 
Main: Fixed issue when VBoxSVC could become unresponsive if Extension Pack was not installed. Either lower the number of vCPUs to 1 or upgrade to BigSur or later where the issue does not occur. Known issue: VMs having more than one vCPU configured will not work properly on macOS Catalina due to an unknown memory corruption issue. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while innotek ensures the product always meets professional quality criteria. VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. Presently, VirtualBox runs on Windows, Linux and Mac hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8, Windows 10), DOS/Windows 3.x, Linux (2.4, 2.6, 3.x and 4.x), Solaris and OpenSolaris, OS/2, and OpenBSD. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL). 
VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use.
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