Materials quality per-platform - organization

Hi,

I have some high-quality materials and levels in my project. Now I'm working on an Android, a lower-quality preset level of the project. What is, in your opinion, the best way to organize this?
Should I create a separate set of Android materials for all high-quality PC materials and substitute them?
Should I have separate variants of PC scenes that are fit for Android, that have less geometry etc.? Or maybe it's better to have tools button that switches on/off certain parts of level's aesthetics?

All best