Is it okay to use the 4K cache instead of UHD Cache for rendering? What are the benefits and drawbacks? I know it's still labeled as experimental, but has it seen enough development since the release of Corona 7 to be considered on par with UHD cache?
How does the 4K cache work that is different from UHD?
edit: I found this
The 4K cache uses only partial caching, so does not try to interpolate everything. While this is slower than a fully cached solution (such as irradiance caching), it does not create artifacts, only noise that eventually goes away.
The 4K cache is an ideal solution for animation, and significantly reduces flickering even when light sources or geometry are moving. This is especially important when the cache cannot be precomputed.