There are a lot of variables and you might want to provide more info - where do you live, what is your main mode of transport, do you have a car, etc.
I have a Quinny Zapp with carseat adaptors for quick trips in the car to restaurants, malls, etc. and a Bugaboo Chameleon for neighborhood walks. But, where we live in an area that is pretty low density, not too hilly, has bumpy but wideish sidewalks and we do not take the bub on busses or the MTR ever.
The Bugaboo would be very hard (and heavy) to move around on public transport I wouldn't even consider it for that use. Its actually a bit too big to haul around and I only use it for neighborhood walks, which I love it for - nice ride for baby, easy to push and steer, and looks nice. Didn't use the cot bit for long, even with a newborn and now it just gets in the way in our apartment, taking up way too much storage space. I also think the Chameleon is WAY overpriced in HK though and bought mine on a trip home for much less (almost half the price) that I would have paid here.
I wouldn't have the Quinny Zapp as a primary stroller in HK because its not terribly sturdy, a bit bumpy on HK's sidewalks (no spring suspension) but fine indoors, has NO storage space and you cannot hang a bag off the back. It is totally unsuitable for a newborn without the car seat. But, its great as a second stroller and for short trips in the car and for travelling.
If I lived in a more urban area I would probably opt for the Bugaboo Bee, which many of my friends here use. Its small enough to fold up for transport, sturdy enough and with a bit of storage to carry shopping.