Which is More Popular: Linux Mint or Ubuntu?

There’s been a lot of online discussion about if Linux Mint is now more popular than Ubuntu:

It makes no difference to me, either way, but I thought this blurb from the DuckDuckGo email newsletter was kind of interesting:

The big news from this month is we are now integrated into Linux Mint,
a popular open source operating system. This partnership helped us
grow about 20% month over month, to over 12 million direct searches.
You can read more about how we are working together here:
http://blog.linuxmint.com/?p=1884

Twenty percent growth from becoming the default search in Mint seems like a huge jump to me. Mint might not be as popular as Ubuntu, but it definitely seems very popular.