I have Fedora 14. Do I update that to Fedora 19 (how exactly? can it be done directly or am I going to have to wade through multiple upgrades?) or is it better to wipe the hard drive and do a clean install? (I have a backup of my data and my installation is very vanilla -- nothing to lose)
Also: Fedora or Ubuntu? Which is best? Am as unfamiliar with one as the other, have some general basic familiarity with Linux in general from running my own web server, but pretty much just enough to be dangerous and follow instructions and copy-paste commands found via google

Also: I have a 4TB hard drive. Partition or not? My amahi server is pretty much a glorified file and backup server. Nothing very fancy so far.
PS: am sitting in IRC channel if anybody is around.