In a word, "YES".
You say you want
"a" woman - why not get heaps - your stay in HK is more than 1 night, right?
I guess if you are familiar with the general bar scene (eg. in Thailand, Philippines etc.) then the Wanchai bars might suit you better. I'd say this is the better option for an overnighter - walkups tend to be wham, bam, here's your $$$'s mam!
But when in HK... try the walkups - they are uniquely HK and pretty easy - if you don't like what you see, walk away.
HG's are a good option and generally worth the extra.
Don't forget K-Pressure - if you're in HK, you gotta try it!
I'd do some planning before you go - pick out a few walk-ups and hotel girls that you like the look of (Do this just a few days before you arrive, because they don't last long). Have the address of K-Pressure and know how to get there (do a search on here for the details). And have a list of the bars you want to try. Then you are prepared. If you don't get to all of them, so be it, but there is nothing worse than missing out because you did not do the research.
Have fun, try new things and report back!