When comparing altyo vs QTerminal, the Slant community recommends QTerminal for most people. In the question“What are the best terminal emulators for UNIX-like systems?” QTerminal is ranked 20th while altyo is ranked 37th. The most important reason people chose QTerminal is:
QTerminal support font ligatures found in fonts like FiraCode.
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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 Font ligatures
QTerminal support font ligatures found in fonts like FiraCode.
Pro Lightweight
Compared to many terminal emulators, QTerminal is lightweight with fewer dependencies than most.
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 Window resize
Resizing the window does not resize the contents, like rxvt-unicode does.
Con Strange default paste action
When pasting into QTerminal, one has to be careful as it assumes immediate execution.