Concerning about the features, we can list the following:

Theming and color schemes.
Configurable hotkey schemes.
GNU Screen style hotkeys available by default.
Full Unicode support including double-width characters.
Doesn’t choke on fast-flowing outputs.
Tab persistence on macOS and Linux.
Proper shell-like experience on Windows including tab completion (thanks, Clink!).
CMD, PowerShell, Cygwin, Git-Bash and Bash on Windows support.
Default Linux style hotkeys for copy (Ctrl+Shift+C) and paste (Ctrl+Shift+V).
Multi-platform support. It supports Windows, macOS and Linux.
Free and open source.