From browsing this forum, I have the impression that the professionals (or quite a lot of them, anyway) tend to use pixels as their preferred unit of measurement.
I've always used millimetres, on the assumption that it doesn't matter what size your monitor is, or what zoom you're using -- millimetres are defined independently of graphic art soft- and hardware.
I've tended not to use pixels because, to me, a pixel is a programmable dot on a monitor -- i.e., pixels are defined in terms of electronic display devices. While you may get 90x90 pixels in a 1"x1" square on a "normal" sized monitor at 1:1 zoom, as soon as you zoom up to say 2:1, you've got 180x180 pixels in that square. Of course, I know that in the virtual world this doesn't have to be so.
I'm not for a moment trying to argue in favour of any particular method, as I cannot speak with any authority. The reason for this rather rambling post is to find out whether pixels are really the professionally preferred unit and, if so, what the advantage is over the more conventional real-world units of measure?
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