When comparing Xiki vs Extraterm, the Slant community recommends Xiki for most people. In the question“What are the best terminal emulators for UNIX-like systems?” Xiki is ranked 23rd while Extraterm is ranked 40th. The most important reason people chose Xiki is:
Xiki uses some GUI concepts on top of shell. For example, commands can have nested menus and these menus are just text indented by two spaces. You can also either use the mouse or the keyboard to navigate or issue commands.
Specs
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Pros
Pro Adds GUI features
Xiki uses some GUI concepts on top of shell. For example, commands can have nested menus and these menus are just text indented by two spaces. You can also either use the mouse or the keyboard to navigate or issue commands.
Pro speed
not the fastest ever, but for me its a good comprimise of features vs performance
Pro Cross platform
Pro Supports tab, splits and panes
You can set up your own layout with multiple splits and tabs.
Pro Shell integration
The shell integration makes it possible to group in command output in "frames" which show success/failure.
Pro Image support
You can view images and other data types like audio directly in the terminal.
Pro Keyboard based text selection
It is possible to go into a cursor mode where you can select text just like in a text editor. It even supports multiple cursors.
Pro Global shortcuts
You can configure global shortcuts to open the terminal.
Pro Keyboard friendly "Command Palette"
Just like Sublime, Atom and VSCode you can easily search and find commands from the drop down Command Palette.
Cons
Con Requires learning many new concepts and ways of using them
Xiki adds a lot of concepts which are not found on other terminals. You have to learn a lot of new tricks to make it useful which unfortunately you cannot use on other terminal emulators.