A program should only use the resources (memory, CPU load) which is necessary for the task it should accomplish plus the resources it needs to provide the user with a usable interface.

Although we prefer programs with a text interface (CLI or TUI programs), because they are lower on resource usage mostly, we recognize that there are use cases where a graphical program (with a GUI) is more reasonable. When it his is the case, we prefer the program that does the job in a reasonable way and has the smallest footprint.

See also How we measure