kubuntu v/s xubuntu v/s ubuntu

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http://askubuntu.com – (before posting this, I looked at a similar thread, but could not find what I was looking for). I am using ubuntu at present. Learnt about kubuntu & xubuntu recently. Visited its websites to find out details. Learnt that these are based on ubuntu. KUbuntu uses KDE graphical environment instead of GNOME. KUbuntu uses XFCE graphical environment instead of GNOME. My need: Programming for database oriented business apps using MySQL & Python. Use online stock-trading terminal based on Java. Should I go for Ubuntu or XUbuntu or Kubuntu? (I read that Xubuntu is faster than Kubuntu). I am (HowTos)