Misclick, I'd take the Ouled Abdoun Basin solely due to it only being 24 hours

Some additional info:

El Mers Group

https://en.m.wikipedia.org/wiki/El_Mers_Group

• Middle Jurassic (Bathonian) Morocco

• Has some unique early Ornithischians such as Adratikilt, Spicomellus, Thyreosaurus and the oldest known member of Cerapoda

• Unnamed sauropods, such as a Turiasaur and ‘Cetiosaurus’ are present

• Carnivores include Steneosaurus, a Teleosaur, and numerous unnamed theropods would present a carnivorous threat

Ouled Abdoun Basin https://en.m.wikipedia.org/wiki/Ouled_Abdoun_Basin

• From the very end of the Cretaceous (Maastrichtian), this formation houses a whole host of species

• There are many small Lambeosaurs, such as Minqaria, Ajnabia and Taleta taleta

• There is also an unnamed Titanosaur (9m long-ish?) which is the largest herbivore we know of from this region

• There are three abelisaurs, the largest of which is Chenanisaurus, which would’ve been the apex predator on land.

• There are many pterosaurs, such as Alcione, Barbaridactylus, Phosphatodraco, Simurghia and Tethydraco. Additionally, it is believed that some fossils from this site belonged to Arambourgiania and Quetzalcoatlus

• In the waters, there are many Mosasaurs and Crocodilyaforms (probably misspelled that). Mosasaurus, Prognathodon and Globidens all live in the region.

Neither

If I was forced to choose one of these I would rather survive in the El Mers Group simply because it is likely less dangerous than the Basin.

But if choosing neither is an option... I'm going with that option.

I think if I stayed out of the water, I could do fine in the Ouled Abdoun Basin

The theropods in El Mers would have to be insanely dangerous for Spicomellus to evolve that Anguirus lookin armor.