i do believe with all my heart that the american jags are better, i can say this becuz i owned an OTC 2003 jaguar avri and it was my favorite guitar for years,(i had to sell it to pay some bet bills)
and since then i have owned 2 jap jaguars.
its not just some wood or paint, or a bit of better parts.
its the whole thing. if you tried to mod a jap jag into an american, and bought a case, you would end up spending more in the long run.
if you got the cash, get the american, you will love it!