I wouldn't recommend local schools at all. Unless your child is rooting for universities abroad, or is a fluent Chinese speaker, the DSE curriculum is harsh (and even harsher when aiming for Unis in HK). Most Universities in HK has a Chinese DSE requirement, and if you don't meet it, it will be harder to get admitted by them even if your other subjects have excellent grades.
I would recommend any ESF school for the reason that they have an IB curriculum. Not sure about IB in detail (as i completed A levels instead), but i know that unis in HK only expect the english and second language of non-jupas students (anyone who dosesn't do DSE applies to uni as non-jupas) to have a pass (unless of course if you wanted to major in english lit, or other majors related to languages).
If you wanted an A level curriculum (as an alternative to IB), then YMCA is the only viable option i can think of. This curriculum is rare in hong kong now. I know another school where i graduated with 3 A's and ended up going to HK University of Science and Technology, but it is not a worthy school in my opinion and its called : Saint Too Sear Rogers International School. It's a happy environment here, but boring... the school lacks enriching activities and are limited in A level electives.