If I have no choice I would choose B. However, I would rather hire a fresh one who never work in HK before (maybe have work experience in S'pore before). From my experience, if the maid is willing to learn, I'm sure she can pick up in two months. Meaning that if the maid has experience in HK but she is not willing to work and change, even you give them six months they still cannot do a good job. And more important, you would much upsad and angry with them as you do have expectation with an experience worker.
For my openion , it's also have to depen what is the maid major work first , take care of children ? how old ? Anyone will stay home with the maid or she work alone , Please give more details. If you have time , may be get another better one , agree ??? :idea: