[CentOS] yum vs up2date

Which is better? Why?

I know yum is the official update mechanism here and in Fedora Core, but 
that doesn't make yum better than up2date any more than Windows NT was 
better than OS/2.

Let's try to keep the discussion objective:-)

I'm asking, hoping for some insights into why RH might (apparently) be 
moving to yum in preference to up2date (yum is now used within Anaconda).

Other than general discussion, I'd also like to know what I'd muss by 
using up2date on CentOS.

I'll start with this:
What has yum  that provides this functionality:
up2date -d -u





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Cheers
John

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