When comparing PuTTY vs mintty, the Slant community recommends mintty for most people. In the question“What are the best terminal emulators for Windows?” mintty is ranked 9th while PuTTY is ranked 10th. The most important reason people chose mintty is:
Mintty is a native Windows wrapper around Cygwin but with added customization features like changing background color, font, transparency, etc.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free
Pro De facto standard client for SSH, Telnet and Rlogin on Windows
PuTTY is one of the oldest and most popular clients. It has earned the trust of a great number of users over a long period by being reliable, offering useful features and helpful support. It got into the 15 Essential Open Source Tools for Windows Admins list by InfoWorld.
Pro Can be used on any Windows computer, even without admin rights
Pro Source code available
Full source available. Compile and modify it yourself.
Pro Lightweight and portable
Doesn't require much resources (memory and hard-disk). Can even be run on a system by just downloading without install.
Pro Support for Cygwin and MSYS
Mintty is a native Windows wrapper around Cygwin but with added customization features like changing background color, font, transparency, etc.
Pro Proper support for scrolling in terminal applications
The mouse wheel in mintty actually scrolls the content in man/less/vim, etc.
Pro Xterm-compatible terminal emulation
Xterm is the standard terminal emulator for the X Window System.
Pro UTF-8 support
UTF-8 allows for the encoding of all possible characters.
Pro Drag and drop makes for ease of use
The drag and drop function in mintty allows the user to move an item quickly and easily.
Cons
Con Only one session per window
Cannot open a second session in the same window (you need multiple windows).
Con Can not save passwords
Anyway, you can use "PuTTYgen" to generate a key pair, then use "Pageant" to do a password-less SSH remote login.
Con Lacks features
It is JUST an SSH client. There are many other options with built in X-servers, Multitabbing, etc.
Con Ugly design, too simple
Looks very dated. Does the basic functions very well, but not much more.
Con No global settings
If you want to change a setting for all your connections, you'd have to do it individually.
Con Organizing sessions
Does not have features for organizing session connections (like folders). If you have 5-10 connections that's fine. But if there are 30-50 connections - that becomes a nightmare.
Con Tedious logging/tracing
Its tedious to set up logging and tracing (e.g. for serial connections).
Con No login scripting

Con No multiple tab support
Con Win32 console API performs poorly
Classic Windows console applications don't work well.
Con No native support for WSL
Cygwin is dead. WSL is amazing, yet Mintty is designed around Cygwin and the WSLtty app to connect Mintty to WSL feels like a hack.
