When comparing altyo vs Eterm, the Slant community recommends Eterm for most people. In the question“What are the best terminal emulators for UNIX-like systems?” Eterm is ranked 31st while altyo is ranked 37th. The most important reason people chose Eterm is:
Eterm requires only around 9 MB of RAM per terminal instance.
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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 Requires very little memory
Eterm requires only around 9 MB of RAM per terminal instance.
Pro Transparency support
Eterm has pseudo-transparency support. This allows the user to make windows look less imposing (particularly in Terminal emulators which can comprise large chunks of text).
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 Focuses too much on looking pretty
Eterm focuses a lot on being customizable and looking good, instead of focusing on features or power.