Interesting subject, to be truthful the more familiar you are with a particular OS that will always be an advantage.
Having said that I’m bias with my choice of OS. It’s very propriety and not so adaptable to some users liking. MacOS , Ios TvOS offer regular updates Free. Interestingly Microsoft have joined that club and now are producing hardware to compete, then to add a curve ball the world’s OS’s are going mobile. It can’t be long before a phone, Tablet could or would be servers. So my conclusion is that Android and Ios are in box seat.
So to answer the discussion question, the OS your most comfortable using.
