I have to be honest, neither of those are particularly tempting. The SiOnyx website says 799$, which is an awful lot for a digital NV unit in this day and age. The TacCams look like they're about 200-500$. A bit better, but still quite a bit considering that they don't actually function as a weapon sight.
I'm mechanically inclined, so I use some version of this, which is about 80$.
https://www.aliexpress.com/item/Hot-New-Telescope-night-vision-Outdoor-Hunting-Optics-Sight-Binoculars-with-LCD-and-IR-Flashlight-not/32800066917.html Mine has a different design mount which I like better, but if you're able to fabricate things yourself, what you're paying for is the convenience of a system which has been built and works. It uses active IR, but that gives you the benefit of eye-shine as BeemanR7 noted, and also means you don't need to re-zero or switch optical systems or anything. All your DOPE and everything remains completely unchanged, and it does work in the daytime if for some reason you wanted to.
Quite frankly, I've seen ATN and PULSAR as having fallen fairly far behind in the whole digital NV world, and have been for quite some time. Their prices just make them not particularly competitive, the bugs (looking at you ATN) make them undesirable, and its all made in China anyway. *shrug*