It not really about difficulty just a way to better expose difference between rendering mode/strategies/setting.reason why i tell you to try test in a way closer to usual workflow.Hm, so far I haven't seen any dificulties using metropolis set up as I did. Random and sobol give fireflies until clamping is so strong it affects total contrast and flattens highlights.
For example small interior/exterior render with specular object and emissive light with simple texturing and different setting.
Metropolis setting aggressive setting tend to impact caustic / highlight / emissive surface / ind