Nix os  vs Mint

It has all of hackage in it's package manager (which is confusingly named "nix" as well) due to being based around hashing and allowing you to compile in a sort of virtual machine (really just changing the PATH variable temporarily) it solves many of the versioning problems that you commonly have with cabal. Here's a tutorial (there's many others as well) http://www.cse.chalmers.se/~bernardy/nix.html.
Also I should note that you can use the package manager a la carte on Mac and most any linux distro.

Since NixOS stores all its packages in isolation from each other in /nix/store and because of the declarative configuration model, upgrading NoxOS systems is extremely reliable. Furthermore, it gives you the ability to roll back upgrades.

Every package in your system is generated from a configuration file. This makes it very easy to reproduce that environment. Just copy the config file into a new machine and it's done.

You can use and test snapshots without rebooting. Booting into snapshots or test configurations is possible without risking the system's stability.

As everything is isolated, you can have on the same machine multiple configurations to meet project requirements that would be mutually exclusive on other OSes.

Crystal is one of the best and elegant languages.

Everything is an expression.

HTML can be written with minimal differences.
Scoped .CSS can be written for elements in components.

200+ unique error messages to help you on the way.

Everything is typed using a simple type system

Only used parts of the code compiles into the final bundle.

Mint has a built-in formatter to format your code, it can run standalone or with the development server.

Mint contains everything you need to build the frontend of web applications from styling to data storage through HTTP requests to testing.

Testing is part of the language and there is a test runner built in which runs tests in the browser.