[xubuntu] Xubuntu 12.04.1 and Linux Mint 13 XFCE, which is more stable ?

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http://ubuntuforums.org – In July, Xubuntu 12.04.1 and Linux Mint 13 XFCE are going to be released. I would like to know which is more stable than another one because my parent are using Ubuntu 10.04, which is very stable but remains one more year support. My parent do not know how dangerous the Internet is (viruses, spywares, etc) so I chose Ubuntu. I want a stable distribution which doesn't show any bugs when I'm not at home and my parent don't know how to deal with it. Thanks in advance. Sorry for my bad English. (Hardware)