I really thought about the Pen (especially because I wanted to drive in the RR, ) and RC. However, being on the main HK side of things and in the "thick of all the action", was more important for us.
There the MO appealed to us with its great reviews and location. Their limo service (s class MB) offers the same pick up and drop off service as the Pen (and other classy hotels, as already mentioned earlier).
It all depends what you want out of your trip to HK. Many fine choices.