IOS update via iTunes vs via WiFi

Just for my curiosity.  What is the difference between updating the iOS with iTunes vs WiFi?
the reason why I am asking this because I read somewhere that sometime users have issue after the update their iOS over WiFi.  Same user that update to the same iOS via iTunes does not have the same issue.  I am talking about Battery Life, or Wifi Problem, or BlueTooht Issue, or Software Bug.
It is possibile that there is a minimum differece in software when the updated is maded over the WiFi vs iTunes?
Thank you

The OTA updates provides a delta update only while iTunes provided the whole build.
Some users have issues after installing the whole build with iTunes as well. If there is a problem after installing the delta update OTA, restoring the iPhone with iTunes to install the whole build for the update may resolve the problem.
I have installed all iOS updates OTA since the option became available and I haven't experienced any problems after doing so yet.

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