php called from cmd or browser? pros and cons?

hi all,
i've recently discovered how you can call a php script from the cmd line on
a windows box and the system i'm building needs to do quite a bit of
'maintenance' stuff like watching a directory for activity, ftp-ing,
archiving etc. i was wondering if anyone has any opinions on what would be
better and why:
running a 'perpetual' php script via the cmd line or opening a browser
window and running the script through there?
any input appreciated,
vauneen

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