The basic difference between the two is QUALITY.
1. The Asian is a copy of the Swiss and its tolerances will not be as accurate.
2. The Asian version uses metals with soft alloys. In other words the stem shafts may bend, the gears may warp easily, etc.
3. The Ashian models come without any lubricants and need to be serviced before you can even use them.
There are reports of people getting versions that work for a few years, but because the quality varies so much it is a hit or miss thing. If you have the chance just get a rep with the Swiss movement. They're well worth the money difference.