well... lets see...
btw i don't go to either school, but:
1. i have friends who go to both
2. my tutors from de la salle, debate with homebush
3. have lived in ashfield
4. go to Strathfield Girls (brother/sister school of homebush)
Ashfield de la salle has very good teachers. They are a private school, but not so extravagant as those really richass ones. They're also quite disciplined. The marks are pretty good
Homebush Boys is... well... they're pretty good at sport. They're a public non-selective. And they do relatively well in the HSC, some years better than others - its hard to predict, since they dont control their intake. So technically they're a really good school. But having said that you get two extremes.
So if you're thinking about HSC results, pick de la salle if your lil bro is undisciplined, and homebush if he doesnt mind a cheapo school, and can still study and take care of himself.
damn... why did i write so much?