DistroWatch published a review on Linux Mint 21.
Linux Mint 21
Linux Mint is one of the better known, beginner-friendly Linux distributions. The project's main branch is based on Ubuntu's long-term support (LTS) releases with an alternative branch based on Debian. The project's main branch is further split into three editions: Cinnamon, MATE, and Xfce.
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The latest version of Mint features a handful of key features. This long-term support release will be maintained through to 2027. It includes a new rebase of the Muffin window manager to import improvements from the upstream Mutter window manager. It also includes a switch from the Blueberry Bluetooth software to Blueman for better cross-desktop support. This release also includes a process monitor which will let us know when automated tasks are running in the background and may impact system performance. A few other improvements and cosmetic changes are mentioned in the project's What's New document.