When comparing st vs LilyTerm, the Slant community recommends st for most people. In the question“What are the best terminal emulators for UNIX-like systems?” st is ranked 8th while LilyTerm is ranked 19th. The most important reason people chose st is:
st is built to serve as a lightweight terminal emulator. It's very light and doesn't require many resources to run, making it able to run well on older and low-end machines.
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Pros
Pro Low memory usage
st is built to serve as a lightweight terminal emulator. It's very light and doesn't require many resources to run, making it able to run well on older and low-end machines.
Pro Extremely simple architecture
st consists of a single C file that takes seconds to recompile. This also makes it very easy to understand and customize.
Pro 24-bit "True Color" support
st supports color escape sequences for a full 16 million 24-bit color spectrum, instead of the typical 256 colors.
Pro Support for fontconfig
There is full XFT (X Free Type interface library) and fallback font support through fontconfig in st. If your selected font is missing a certain glyph or symbol, but one of your other installed fonts has it, it will be shown.
Pro Copyfree licensing
Copyfree licensing implies that the user has the freedom to copy, use, modify, and distribute what he/she possesses.
Pro Image previews
Handles image previews (e.g. in ranger) way better than other terminal emulators.
Pro Patches are great
The patches on the site are great. Scroll back, hide the mouse, etc.
Pro Minimalist
Hackable and lightweight.
Pro Blazing fast
it is extremely responsive and fast, even on older computers.
Pro Clean
The terminal doesn't have any bloated features nobody uses. It is very minimal and extendable.
Pro Support for tabbing
You can also color and reorder tabs, as well as manipulate tabs through keybindings.
Pro Transparency support improves usability
LilyTerm has true transparency support, making for better GUI usability.
Pro Change encoding on-the-fly
LilyTerm can change encoding on-the-fly. UTF-8 is the default encoding.
Pro Lightweight
LilyTerm is a terminal emulator that aims to be as lightweight as possible. It requires minimal system resources and has very few dependencies.
Pro Fullscreen support
LilyTerm has fullscreen support which improves visibility.
Cons
Con Configuration requires recompiling
Though recompilation takes seconds, knowledge of C header files is required for customization (though it's pretty easy to do for someone who knows how to edit config files).
Con Text is cut off when resizing windows
In the vanilla build, when reducing windows, lines do not wrap, they are cut off. When the window is made large again, some of the text is missing.
Con Crashes when some characters or colored fonts are displayed
Con No scrollback by default
The best way to perform scrollback is to use a multiplexer (such as tmux, screen, or dvtm) if you want scrollback and reverse-search support.
Con New features means installing patches
Just to get copy/paste support and scrolling, you have to install patches. And it's not that intuitive for a beginner.
Con Internal border/margins
Doesn't support internal margins.
Con Source code edits (aka configs) need to be redone after updating
Con Imperfect fontconfig support for CJK characters
It [st] doesn't seem to use CJK fonts provided by fontconfig while other programs use such fonts.
Con Annoying behaviors
The default configuration may have some annoying behaviors (that can be removed by changing the default config). Such include asking for confirmation when reusing an existing window or when starting the terminal to launch a specific command.