According to prism-break.org Ubuntu also has some security leaks. They can, however, be fixed. I like Mint which is Ubuntu based and also Mint Debian. Fedora is very good also but I don’t like the desktop as much as Mint’s Cinnamon desk top.
That aside, Firefox is far better than IE, Chrome or any other proprietary browser. I only use Firefox.
MATE on Mint is fine but I've grown very accustomed to KDE4...and that took some doing for me since it was horrible before about the 4.9.X series. I've become very used to Activities, allowing me to partition my workload far better than anything I've seen before.
I tried several different versions of Linux this past week off of my USB card and I have to say that Ubuntu is still the best. I tried Linux Mint 16, Puppy, Simplicity Linux (Pupplet that didn’t even bother to remove the barking when loaded), Linux Console 2.0, and more. I also looked at a bunch of websites about others during this time.
None of the ones I tried were anywhere near as smoothly operating, nicely designed and works as well as Ubuntu 12.04 LTS
Linux Console 2.0 did nothing when I tapped the touchpad, I had to use the actual buttons to get anything done. It also looked a bit like Windows 3.1, lol