The NYX pencil has a more intense, pigmented white color to it, but that's not to say the Jordana is not pigmented. The jordana still shows up very well but blends out to have less pigmentation than the NYX pencil.
The Jordana pencil sets to a very solid state and does not budge, whereas the NYX pencil never really sets, it stays tacky and is still smudge-able after several minutes.
The NYX pencil will crease on my eyes with and without primer. The Jordana pencil does not crease at all, with or without primer.
As a Base:
Both pencils hold eyeshadows very well and work excellently as bases to make colors pop.
As you can see in this blended out picture, the Jordana pencil had already started to set in just the moment it took for me to take the picture of it unblended. The NYX pencil blends out more smoothly.
Overall, I would recommend the Jordana for anyone who has oily eyelids or hooded eyes that crease easily. NYX is still a great product if you can find a way to keep it from creasing on you. For me personally, I can only make the NYX last a few hours before creasing, whereas the Jordana pencil lasts all day.
I hope this was helpful.
Thanks for reading!