This question already has an answer here:
I have been using Subversion for a while, but am seeing all my colleagues switch to (or advocate) GIT. So I googled to find some info on the differences.
In the top ten results was this SO thread...
It was closed as off topic. But, of all the Google results I received, that SO post was the most objective and informative. This because it was written by multiple authors and allowed point/counterpoint. Additionally it had the collective brain power of several dozen of SO's resident geniuses behind it.
I wanted to know more about why it was off topic. I looked at the FAQ. In the FAQ one of the criteria was "software tools commonly used by programmers". Well, is this not a question about exactly that? Software tools commonly used by programmers?
I agree that if a software tool comparison question is asked more than once, it should be closed as a duplicate. But software tool comparison questions are not off topic according to the FAQ and should not be closed. More than that, we will lose access to useful/valuable/above-average information if we do.
EDIT: Sorry I mis-spoke. It was locked not closed. But only because it was historically significant. However, had it been a new question, I assume the moderator would have closed it as off topic.