I'm planning to start with online, since it opens up an hour earlier (4am my time, yikes!) If, after an hour, I'm not finished and really tired of fighting with the computer then I may call for the rest.
And like a PP said, be prepared that some times not everything is accepting ADRs yet at 180 days. Had that problem a few years ago with CRT, it was almost a month before they opened it up for ressies for some reason! And if that's the case, calling doesn't help either. In fact the CMs don't usually know whether the ADRs are simply gone, or if it just isn't accepting any yet, all they can tell is that nothing shows up as available.
I actually prefer to do stuff online, b/c I am such a visual person. I like to see all the info right in front of me and know that it's right. Otherwise I start worrying that the Cm accidentally punched in the wrong date or something.