I've had four Nikon scopes. Three 3-9x40, one was a Team Primos and another was a Monarch 3-9x40 and one was a Pro-Staff. The other one was a Monarch EER for a Scout Rifle project I was working on. but I don't remember the power.
All of the Nikons were stout and held zero once they were set.
I've never heard of Explore Optics. That doesn't mean they aren't any good, it just means that I've never heard of them.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams