In general, the larger the objectives, the more light is gathered, and the more you’ll see- however, the larger objectives, the heavier the binocular. Magnification should be 12x or lower- any higher and you’ll have a hard time getting a steady view. Low magnification binoculars have the advantage of a big FOV (field of view), which makes navigating the night sky easier. They provide glorious views of star clusters and nebulae, and are wonderful for exploring the Milky Way. On the other hand, don’t expect to see planets with any detail- they are very tiny objects at these magnifications.