[Maxatar]

For most real time systems, including many games, it doesn't matter if one is more efficient than another because what matters is the predictability that comes from always rendering a complete frame in 1/60th of a second.

In many cases checking if absolutely nothing changed in a system isn't trivial either. You either have very fine grained tracking which involves a great deal of complexity and increased memory cost, or very broad tracking which results in a lot of false positives.