People who use spaces over tabs apparently make more money
businessinsider.com
businessinsider.com
I regular deal with code from a specific project, in which different files can use different tab sizes as well as a mixture of tabs and spaces (dependent on who has worked on the files). As a matter of course, I set the tab size to 8 for any file that has tabs and convert to spaces before setting my tab size back to my preferred size.
One subsidiary task I have for this project is to modify the UI editor for the project to handle the conversion of spaces and tabs according to your preferences. While saving any system files in the project lead's preferred style.