Nikon mount on the lenses is among the most versatile ones if you want a lens set which is compatible with as many camera models as possible.
It can be adapted very easily to for example Canon EF, Micro4/3, E-mount, C-mount, etc. and you can use it natively with Nikon cameras or even certain NikonF adapted film movie cameras (for example adapted Arri 2C , Eclair Cameflex, Arri 35-3) .
Nikon F also generally has better quality mounts with less tolerances and play compared to EF mount and it is much sturdier than M4/3 or E-mount.
Adapters may have slight tolerances so you may need to shim and adjust them a little to enable absolutely correct FFD with the camera so that the distance markings will be correct.
Samyang/Rokinon lenses themselves, by my experience, have so bad quality calibrating/wide tolerances though that you may need shimming anyway to be able to use them in any kind of production environment, especially the wide angles where FFD is more critical