how the comparasion of OS are take place ? [closed]

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how one can say that one OS is better then another.?

i am asking specially about mobile OS.
because people says i-phones are better then android phone or blackberry mobile.
i ask you how phone can be compare with OS...

its all about hardware. isn't it. if hardware is good enough then its facility will be always good. right. because OS just maintain system calls & use resources of system in efficient way.

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Yes I agree. And this extends to desktop computers, I run Windows 3.11 on my Quad core machine. Its all about hardware.