Currently Being ModeratedSep 12, 2013 7:57 PM (in response to Clueless ipod)
As in over the air vs through iTunes?
When you do it over the air you download a smaller package and it's just the updated parts. When you do it via iTunes you download and install the whole operating system.
Many update OTA and have no issue, I perfer to always do it through iTUnes.
The most important thing is to always do a full sync and backup before you update the OS. Then you have something to restore it from just in case something goes wrong.