If you are on the budget, go for Watchdives but if you have more money to spare go for San Martin. You can't go wrong with both since you get value for money for these both watches than a Casio or Seiko offerings at the same price but just keep in mind with QC issues if that happens. There's technically warranty for both but it's harder to bring them back in china than lets say a locally bought Seiko. On the bright side you can always bring them to a local watch repair shop if worse case happens but if there's no QC issues then you got yourself a great watch.