If it was me (and I’ve been in your shoes before, looking for glass on a $1G budget) - Id hold onto my tokens and wait to find a used SLC HD for $1200-$1500. And that can be done here or other hunting sites.
The problem (IMO) with all three you’ve listed is the resale. Now if you’re a “buy and use and hold” kinda guy with your gear, then it won’t matter.
But if you enjoy trying new gear, different magnification, etc etc - then resale matters. And on the conquest, Nikon, and vortex - you’ll take an immediate 25-30% hit the moment you buy them. Even unused. I’d guess the nikons will hold value the least, just due to name alone. And the Zeiss likely hold value the longest. Also, due to name.
A used SLC HD...you could buy em for $1300, use them for years, and sell for almost the same. Like a free Bino rental.
Like I mentioned - I’ve been there, and until the resale market says otherwise, I’ll buy Swarovski. Even if it’s a slightly better view for a decent chunk more.