why ubuntu is #1 linux?

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http://askubuntu.com – actually my office is going to buy bulk no of desktop pc's (for developmental purposes) . i encouraged them to buy pc without os and then install linux . My colleagues are agree with me but they are not a regular user of any linux based os so they want to choose a linux os which is best and user friendly i suggested "UBUNTU" and i want some data to prove myself so what i want is 1) Technical comparison of ubuntu with windows 7 (professionals) 2) Technical comparison of ubuntu with other majar linux os (opensuse,linux mint,fedora) please share the source because i have to make a presen (HowTos)