When comparing Tilix 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 Tilix is ranked 22nd. 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.
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Pros
Pro Multiple sessions inside a single window
In addition to tiling, Tilix supports placing separate sessions in tabs or switching from one to another through a sidebar.
Pro Tiling makes for ease of use
The user can split terminals horizontally or vertically, according to their needs or preferences.
Pro Integrates nicely into GNOME 3
Tilix follows the GNOME Human Interface Guidelines and uses the UI patterns of this desktop environment.
Pro Good alternative to Terminator
Tiling and ability to type into multiple terminals simultaneously is Terminator's 2 most significant features. Tilix has them as well.
Pro Configurable shortcuts
Many actions in Tilix can be triggered with configurable shortcuts.
Pro GNOME Human Interface Guidelines
Tilix follows GNOME HIG whereas gnome-terminal doesn't. GNOME should use Tilix as their default terminal.
Pro Transparent background
Unlike the standard GNOME Terminal, Tilix supports configurable background transparency.
Pro Fancy looks
Tilix has that new GNOME look, with a HeaderBar. It can also be disabled.
Pro Able to write into multiple terminals simultaneously
Inside a session, you can select multiple terminals, which will receive the same input simultaneously.
Pro Can be used as a drop-down terminal
The new 1.30 version of Tilix supports a quake mode enabling it to work as a drop-down terminal.
Pro Extremely fast
As fast as gnome-terminal, if not faster.
Pro Copy on select
Pro Faster than Gnome Terminal
When running commands it feels snappier.
Pro Easy
Pro Copy as HTML
You can copy text from the terminal as HTML for embedding in web settings.
Pro Lightweight
Pro Solarized themes built-in
Great support for solarized color schemes, and no setup is involved.
Pro Terminus can notify you about finished tasks and perform actions based on terminal output
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 Unmaintained
Bugs and pull requests are not processed.
Con No font ligatures
Con Takes a bit more memory than Gnome terminal
Would've expected this to be more lightweight.
Con Heavyweight
Tilix has quite a lot of dependencies and takes ~100MB of RAM when running.

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.
