Why use Spaces over Tabs for Indentation in Code Editors - Eclipse

When I started coding in Eclipse, I was not aware that by default Eclipse uses tabs for indentation and tabs can have varied with e.g. 1 tab can be equal to 2 spaces or 4 spaces or even 8 spaces. Sometimes, It's all up to you how you configure tabs in your code editor, and other times just at the mercy of the tool you don't know how to configure like VIM in UNIX. I only realize the problem when I found too many differences in a file while check-in in into SVN. Apparently, other people were using different indentations (spaces) and that's why the file was showing so many differences when I reformatted them in Eclipse. 

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