09-24-2012 09:40 AM - edited 09-24-2012 09:47 AM
Both are good... it's according to what your needs are.
I've done a security wipe and restored my personal data from the backup many times.
I rarely just reload the OS, but do upgrade when available.
09-24-2012 10:51 AM
You can press the your Menu key about two seconds to show what all apps are running on your device in the background. Close some of them not needed.