I have to say I can't see going back and playing my 360 version ever again after playing with all these. Question does the OMOD version included all of the UL? I would love to have all of them and plan on grabbing any others that get released in the future. I have to say my all time favorite so far is Cheydinhal Falls.
No.
The OMOD is something put together by someone outside of the UL team, so at times may not be as up to date.
It's actually a few behind at the moment.
Updates required:
http://www.tesnexus.com/downloads/file.php?id=9531 (from 1.6.4 to 1.6.5)
http://www.tesnexus.com/downloads/file.php?id=11162 (from 1.0.4 to 1.0.5)
http://www.tesnexus.com/downloads/file.php?id=11164 (both say 1.3, but this has been added much later than the OMOD)http://www.tesnexus.com/downloads/file.php?id=20332 (from 1.1 to 1.1.1)
Basically go to TESNexus,
do a search for "Unique Landscapes"
and sort by "last update" and "descending"
Then you want to look at everything before (thus newer than) the OMOD.