As others said, it all depends on your preference, especially the interior.
My take: the Limited has the nicest grille, while the Longhorn has the nicest interior. Others will have a different take.
Aside from cosmetics (Night Edition, interior color), there’s nothing I know of that’s available on the Limited that you can’t get on the Longhorn.
However, a fully loaded Longhorn will end up a grand or two more expensive than a fully loaded Limited, in large part because some standard features on the Limited (Hemi and air suspension, in particular) are options on the the Longhorn. On a $70K truck, is $1-2K enough to sway you towards your second favorite, if that is the case?
For me, I specifically did not want air suspension, so that made the Longhorn an easy choice (note, Limited is available without air suspension in Canada). But it was already my first choice, and since I ordered mine rather than picked off the lot, no reason not to get it.
That was my decision; base yours on what you like best visually, as they are otherwise about identical.