In theory, for "unbiased path tracers", the results of all three should be the same, at infinite samples. Rendering for a finite amount of time, lower noise sug

In theory, for "unbiased path tracers", the results of all three should be the same, at infinite samples. Rendering for a finite amount of time, lower noise suggests the renderer is more efficient. In practice, every renderer has different features and settings, so the actual scenes will only be approximately the same.