Git vs SVN: website storage efficiency

I know that SVN (Subversion) stores files' deltas in order to efficiently store data. Git however, is a little more complex. What I'm wondering is that if I were to store plain HTML, image and js files, and keep track of their changes with either of them, which one would result in a better storage efficiency and why? I'm especially more interested in HTML files. At first there shouldn't be much difference. However, as the website changes, especially the home page, the difference should be obvious.

I could try both of them and compare them, however, it would take much time to see any real results. Hence, I decided to see which one should be theoretically more efficient.

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