I doubt there is any really super significant difference, turrets are setup a bit differently, glass may be very slightly different, reticle choices, how many people can really pick out that difference in glass, is hard to say. I'd have no issues with grabbing another Delta, or a Tract, but, probably would go with Apex anyway, just because it's being done by Cdn's. In that class of scope, from the Japanese makers, it just comes down to what features you like best with the turrets and reticles of the two, and there are at least 10 more brands out there, that the choice is the same on, just slightly different cosmetics, from the same mfgrs in Japan. Zeiss V4 is a Japanese build too. There isn't a bad scope there, in that class of scope, And I think Apex understood what they were getting into, in the market sector they chose to start off in, and designed a good product for that market segment.