which of this versions is the best to play? What do you think? And why?
Does it even matter?

Tokyo Xtreme Racer WikiTokyo Xtreme Racer 2 is the first game in the series where the player can personalize their car's license plate when buying a car. The license plates in the Japanese version are Japanese plates, while cars in the North American and European versions have California plates. It may be possible that in the Western versions, having license plates from a Western location would fit with the "Westernization" theme of TXR2. The rival cars in the Western versions have license plate numbers similar to those of the then-current California "Sesquicentennial" license plates, which were issued from 1998-2000. The word "Sesquicentennial" is incorrectly spelled "Cesquicentennial" on the plates.
Tokyo Xtreme Racer 2 – Performance ListThis guide is for the US version of Tokyo Xtreme Racer 2. The European (Tokyo Highway Challenge 2) and Japanese (Shutokou Battle 2) version may be slightly different. To my knowledge there are six cars found in the US version that the JPN game is missing and one car JPN has that the US doesn't have. Some other difference between the two versions is that the US version is supposedly more refined (it fixes or minimizes some of the problems the JPN version has such as automatic resets, freezing, camera glitches and slowdown). There are couple others differences but this is not the topic of the guide.