When comparing software.jessies.org terminator vs Tilix, the Slant community recommends Tilix for most people. In the question“What are the best terminal emulators for UNIX-like systems?” Tilix is ranked 12th while software.jessies.org terminator is ranked 36th. The most important reason people chose Tilix is:
In addition to tiling, Tilix supports placing separate sessions in tabs or switching from one to another through a sidebar.
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Pros

Pro UTF-8 support enables character encoding
Due to UTF-8, this terminator won't mangle your favorite accented characters, and it copes well with languages where there's a mix of normal and wide glyphs (such as Greek).

Pro Unlimited scrollback
Terminator won't throw away output when it scrolls off the top of the screen, nor when it reaches any arbitrary limit.

Pro Multiple tabs
This is just like tabbed browsing, only with terminals, and means that multiple pages or documents are contained in a single window.

Pro Horizontal scrolling
Most terminal emulators wrap text when it intrudes upon the right margin. Terminator doesn't; it instead provides a horizontal scrollbar when necessary.
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
Cons
Con Seems to have been abandoned
There are several issues posted since 2013 on the project repository that have not yet been solved.
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.
