Which is better: 12V LED or 24V LED?

In RV and travel life, lighting is one of the fundamental components of comfort and safety.
The question "Which is better: 12V LED or 24V LED?" frequently arises because vehicle electrical infrastructures,
wiring needs, and usage scenarios differ. In this article, I explain the advantages and disadvantages of both systems,
from both technical and application perspectives, and which one you should choose in which situation, with practical examples.