As you know those brands like zeiss, leupold, Swarovski etc.. have been around since Fred flintstone, and are very established brands, and they make the best scopes in the world.

Nightforce started 1992 and are mostly made for militay, competition and long range shooting, not for the average hunter.

Aimpoint have been around since the 70s and are a swedish company, but i dont know why you never heard anyone recommend aimpoint.Great scopes and originator of reflex scopes.

Trijicon using tritium, which is a radioactive hydrogen.Makes the reticle glow, which is great in low light hunting.But I dont think the average hunter will buy a trijicon, he/she will go for a more allround scope.