He loses concentration and turns goofy in the middle of sets and one bad game and voila he loses the set so I’d say BO5. He has more time to reset and adjust. Every BO5 loss he had in the last few years, he starts adjusting but sometimes it’s too late like during the USO SF against Med, Wimb 4R and RG SF against Zverev. He does not get this privilege in a BO3 setting