Armasight is an American company that use a variety of Image Intensifier.
Night vision is judged primary by the image intensifer and secondary to the housing manufacture.
Most high-end American company will use
Exelis (formerly ITT) and L-3 (formerly Litton), they are considered top tier stuff in terms of NV. Unfortunately accessing those outside of US are hard due to ITAR. The export version are limited to FOM <1600 (if you're a LE/MIL customer ie Australian and Canadian Army).
Kato'd is a Russian company, their high end IIT are very comparable to Exelis & ITT's but more expensive compared to equivalent US IIT. AFAIK GSCI and Newkon Optiks uses Kato'd for their Gen 3 stuff.
Photonis is a Dutch company, they make very high end Gen 2 that are comparable to current US Gen 3 commericial stuff, they're also more expensive compared to US.
Ekran is another Russian company that makes Gen 2 IIT, the quality range from typical Gen2 to Photonis' commericial lineup.
Armasight does use Phtonis and Ekran stuff, so far I have no heard of an easy way to distinguish Photonis from Ekran in their Gen2 SHD (Super High Performance) aside from opening the unit.
What are your thoughts on Newcon? I am looking at getting either their Bino's or a mono PVS14c...