Bump 
Want to know too.
In our VR project we use a lot of decals, but thinking about vertex paints for some of effects (cause in profiler decals sometimes take a lot of time( ).
And what difference in Decals vs Vertex paint? seems Decals make mesh render twice? does Vertex paint do same? or can they can be baked?
Can anyone tell me - what is more effective for GPU perfomance?
yeap. sorry for my English.