Depends what you want out of your watch. Fitting a VJ23 into the existing DW case is the preferable option as it is a much more reliable movement. However like the DW movement it is a bi-compax movement ie only two working chrono dials. There is no hour chrono dial on a VJ23. For that you will need a VJ72 and then a case to take the movement, new hands etc.
Personally I serviced my DW movement myself and it seems reliable, albeit not very well constructed. The hands reset perfectly but I still don't use the chrono function, as I don't trust it's longevity.
The VJ23, just like the DW, is a manual movement. So was the movement in the Genuine watch as well.
You pays your money and you take your chances, so to speak.