The USO is made in China. The Tenmile in Japan. Dont know if either of those are a factor for you. I can attest personally for the customer service at USO as I bout my first USO FDN last year and they have been nothing short of amazing with putting up with all my questions, requests and screw ups. Ive heard nothing bad about the Trijicon Ten mile that I know of but also dont have any first hand experience with them. Being made in Japan I would say there is a good chance they are produced by LOW (Light Optical Works) who make several big name scopes like Sig Saur and such. My experience with these scopes have been very good as well. Just killed two deer in less than 30 seconds last week with my .243 using the Sig BDX 4.5-14. The USO TS line is made in China but goes through USO's quality control which according to "Cyclops" on youtube is 2nd to none, and I have to agree now after dealing with them for over a year. Dont know if any of this helps buy you have now been enlightened by my years of useless knowledge.