Xubuntu vs Mint Xfce vs Zorin Lite

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http://askubuntu.com – I have Kubuntu installed on a Thinkpad r31 with 1,2ghz celeron cpu, 632mb ram and an Intel 830m graphics chipset. I chose Kubuntu because it was recommended as a linux distro that looks much like XP. Because I'm giving the laptop away to a family with no money and I do not know their computer skills, I'm wondering if Kubuntu is the right choice for them. I have looked for alternatives and found 3 options: -Xubuntu (or Lubuntu with LXDE) -Linux Mint 13 Xfce -Zorin os Lite (Lxde) important is: - LTS - much windows xp-like - works best with hardware specs Which distro would be the best optio (HowTos)