[ubuntu] Old version vs New version

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http://ubuntuforums.org – I used ubuntu 10.04 way back when, and I loved the gnome 2 look. Had it configured exactly how I loved. Problem is I lost the rig it was on, and am getting on; but am seeing a whole new desktop for ubuntu. Gnome 3 and/or Unity. Just have a few questions: Is there any reason not to just re-download 10.04 and stick with gnome 2? If there are, can I get back to a gnome look to how I might have had it before? using applets / panel backgrounds / etc? What are the pros/cons of 10.04 vs the new 12.04 (like, are there noticable speed improvements in the system) any answers will help greatly. (Hardware)