When comparing altyo vs Xiki, 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 altyo is ranked 37th. 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.
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Pros
Pro Few dependencies
Altyo has very few dependencies (it only depends on libvte and gtk3) making it a very lightweight terminal that doesn't require many resources to run.
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.
Cons
Con Not very powerful
Even for a terminal that aims to be as lightweight as possible, altyo is still not as powerful as it should be. It doesn't have many features found in other options and it's not very customizable.
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.