It's ALWAYS better to update the Mac OS X, through Software Update, rather than the downloadable Combo Update. And if you are 'forced' to do it that way because your unit doesn't have Internet connection (which is rare in our days) then 'force' yourself to connect to it somehow and update through the Software Update!![]()
Why should that be? Apple releases both delta and combo updates, both should get you to the same destination, and you choose one or the other based on convenience.
For me, it is much more convenient to download the Combo update *once* and use that *one* download to upgrade all the Macs (5) in my household, and also use it to upgrade my parents-in-law's iMac that I manage, when they only have a 1GB/month download quota.
The positive in all this is that my last Time Machine backup worked perfectly and after a long restore process, I'm back up and running on 10.6.7 without any hitches.