Hi,
Both of these quads seem like a good choice for a beginner in this field although the Nighthawk kit seems to be a bit outdated (using Simonk ESCs) but this shouldn’t be much of a problem. Apart from this, the Nighthawk might be the better option for you. We have made a complete beginners guide for the ZMR 250 frame kit (please follow the link) that you should be able to follow if you use the Nighthawk kit or any other mini quad build.
If you have any questions, please let me know.