The only official answer we will get is to use what the owners manual says. Which is (of course) Mopar stuff only, at least for the 44-44 xfer case.
I think the xfer case and diffs are a non-issue in my book, I would use the overpriced Mopar stuff just to keep warranty intact. Its not like we need gallons of it.
The transmission is a different story, but even still I would probably stick with the overpriced Mopar stuff, change it around 60K miles and then probably never again. I think the biggest deal there is to get any breakin material out ASAP, from then on the fluid will probably hold up just fine for a long time.