The magnification of any optical device depends on the ratio of the focal length of the objective to the eyepiece. But, due to the peculiarities of the technical design of the NVD, the eyepieces of most similar models have practically the same characteristics. So in the end it all depends on the lens itself.
When choosing, the field of view is important

The field of view is usually indicated in degrees, other things being equal, the larger it is, the better. In the dark, even with a night vision device, it can be difficult to navigate. A larger angle of view will allow you to cover a larger area for observation.