I think this is an easy win for Tiergarten Nuernberg. They might have slightly fewer species (28 vs. 33) for this category, but enclosure wise they win comfortably. There aren't any enclosures with major issues and the vast majority of exhibits are large and well-structured.
Pairi Daiza on the other hand has a not so impressive elephant set-up (huge but boring) and a seriously lacking pygmy hippo exhibit. Quite a number of other exhibits are fine, but not great.
Here are some direct comparisons:
Blue sheep in Nuernberg (shows only a part of the exhibit)
@ralph
Blue sheep in Pairi Daiza (shared with binturong)
@KevinB
Sika deer in Nuernberg:
@ralph
Sika deer walkthrough in Pairi Daiza:
@KevinB
Eland & Grant's zebra mix in Nuernberg:
@Philipine eagle
@Philipine eagle - African buffalo exhibit
Grant's zebra, wildebeest, scimitar-horned oryx, impala, with Cape buffalo in the background, which appear to be separated.
@KevinB
Enclosure-wise these are Nuremberg highlights:
@ralph - Alpine ibex
@Paul Kalisch - Addax & Somali wild ass enclosure (part of it)
Least attractive in Nuernberg are probably the Malayan tapir & babirusa exhibits, but that is mainly looks as both have still a significant amount of space, but with a building style from the 70s.
@lintworm (one of 2 babirusa exhibits)
For Pairi Daiza the visual highlight is the South American tapir exhibit, which has a lot of water with a mill in the background:
@Maguari
@KevinB
Obvious lowlight are the 2 pygmy hippo enclosures:
@MagpieGoose
Apart from the lovely tapir set up, I cannot think of any hoofstock exhibit that Pairi Daiza does better and I can think of a fair number which are worse...