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In my experiences from working in a workshop, 140mm rotors need regular replacing due to more wear despite pads having plenty of life left (resin) on top of the warped.
When quoting bike for a service, I always put down a recommendation of going for a 160mm over 140mm, it’s helpful that the flat mount standard mean I can just flip the adaptor the other way roins to use bigger rotor.
AFAIK, only Shimano happily recommend 140mm rotor in all but the largest cyclists, and they spend a lots of R&D in designing their 140mm rotor to dissipate as much heat as possible.
160mm mean better heat dissipate, longer lasting, and less likely to warp especially the floating rotor design.
TL:DR; I concur with @Chak finding, from customers bike to personal bike.
edscoble
It does matter as im interested ... I have done fairly decent sized descents and not had an issue, you cant post in a forum and not expect questions :')