For HK, each girl on site such as go141 will publish their rate and it's usually 1 pop as soon as you are done you can GTFO type of deal.
The Walk-Ups are my favorite and I mix it up with HoneyGirls.
Walk-Up in TST James Lee Mansion has about 60-80 girls mostly from floor 2,4,5,6,8. I enjoy knocking on the doors and occasionally find a cutie that is willing to do you for 500 HKD or 600 HKD ($64 US or $77 US). I've seen really cute Thai girls and also seen Russian ones for $600 also. This is pretty much in a small room, you get in, shower and bang and then leave. Do know that there is a ton of people walking around each floor checking apartments, if you are shy, don't go to walk-ups cuz you will run past a lot of dudes looking for pussy. I'd say I've seen a couple of top-10 ever in terms of looks for girls at walk-ups that I could not believe my luck and it was only for like 500 HKD.
Honey Girls typically starts at 1000 HKD and are at hotels near by. Specific outfit typically camp at a specific hotel so you can text a few places and find out where they are and start to head over while you text them for the girl you want. The Honey girls have more GFE vibe, generally younger (20's) and will provide better service such as BBBJ/69. Since they are in a hotel, you get to use a better shower, better bed, better vibe overall. I generally accept the girl I see (you give them a number, most of the time it's good. A couple of times I was baited old HAG then I would decline and they will quickly find new girls for me in the same hotel (different rooms) for me to visit and check out. Most girls are from China and some of them are really sweet and provides good time.
For HK mongering, I find TST best for the selection, easy of access and also cuteness. Causeway is ok... Central is too expensive and as you travel up toward Jordan and Mongkok, the quality goes down but the price goes down also toward 400 HKD for walk-up and 600-800 for "Honey girls".
I've never done overnight but I did ask them once, the Honey Girl will come to you but not let you stay at their hotel. I didn't bother since I rather just get a different girl if I want to nut multiples time a night and they do outcalls.
HK is the best place if you're looking for a lot of quick variety of hits once a day or multiple times a day.
Oh I forgot, Sheung Wan has a walk up (Hing Looon building) that is just a short walk up from Central Some girls there will allow AF and it's a nice place to go after you drop off your luggage at the Hong Kong airport express service terminal and come here for a quick release and some food near by before heading to the airport.