Choosing an approach to Fedora upgrades.

[CB <fedoralist crispin cb-ss net>]

What approaches do people here use for upgrading Fedora installations?
I'm assuming that one wants to upgrade, even if only for curiosity.

The options seem to be (all assuming /home to be a separate filesystem
which will be appropriately mounted after the upgrade):

- choose 'upgrade' option from the latest fedora install ISO set
- choose 'install' and reinstall all the required applications (maybe
scripted?)
- upgrade using yum or apt-get (I don't know how to do this, but it is
apparently possible)

Can anyone suggest how to choose between these? Fedora has a pretty high
rate of version churn and for anyone like me who wants to keep up it's
going to be important to establish a reliable and non-labour-intensive
procedure.