A lot of the difference seems to be about outdated languages versus trendy languages. (Maybe the newer ones are better which is why they gain popularity).

For example, I personally see the power in git, but find it a pain in the arse to use other than for basic stuff. CVS was far simpler, and I never had much trouble with that back in the day. But git is pretty much the standard version control these days, and it doesn't make much sense to use the others.