I've never bought or owned an Xbox, but my friend has a One, bought new at roughly the same time I bought my PS4 new (2014). my PS4 sounds like a helicopter taking off and his One is almost silent. I remember roughly similar experiences for my PS3 and others' 360s. it seems that perhaps Microsoft is (or was) less expectant of you buying their Slim/XS/mini/etc model in 3 years time. no idea how true this still is though