Acoustic and electric are not simple opposites such as natural and artificial. An acoustic instrument can be recorded with a microphone or amplified through a system. An electric guitar can sound restrained or heavily processed. A useful comparison therefore separates how the sound originates from how it is recorded and reproduced.
Begin with the instrument
In an acoustic guitar, string vibration is transmitted to the body, which contributes to the radiated sound. Yamaha's instrument guide explains this relationship. Electric guitars also come in different constructions, including solid and hollow bodies. The idea of one universal electric-guitar sound is therefore already too narrow.
With a recording, signal capture and processing add further variables. An acoustic guitar with a fitted pickup remains an acoustic instrument even when its signal is amplified. The word unplugged in a release title does not automatically explain the entire recording process either. Precise claims require information about the particular production.
Choose comparable material
Use two versions of the same short musical idea where available. Attend to attack, decay and connections between successive notes. A strongly sustained note may permit different phrasing from a rapidly fading one. That is a musical possibility rather than a general ranking of quality.
Check whether volume and arrangement dominate the comparison. A solo acoustic guitar creates a different setting from an electric guitar surrounded by drums and several other parts. Drawing a conclusion about the instrument alone would mix instrumentation with the source itself. In such cases, describe the two complete versions instead.
Listen to choices rather than labels
A sparse recording may expose pauses and incidental noises more clearly. A processed version may extend notes or combine layers of sound. Either can be dense or economical. Ask which movement becomes easier to hear in the particular version and which recedes into the background.
For a shared discussion, one precise comparison is enough: in the first version each note ends clearly, while in the second the notes overlap more. Then explain how this changes the phrase's character. That is more checkable than claiming electric instruments are inherently louder or acoustic ones inherently more expressive. The category describes possibilities; the audible performance and production determine which are used. If you cannot separate those contributions, stating the limit is more informative than guessing.