First off I think if this discussion were to have any validity we should divide these girls into age groups first.
Chinese Educated (Private school,SMJK, you name it )Age group 14-16 (Form 2 - Form 4)
In my personal opinion, which is also in tandem with the views of most forumers who replied here is that those who fall under this category of age and education tends to be more impulsive and rebellious. (Most of the case)
I've been teaching tuition for a few years and most of the students I got from co-ed schools which are SMJKs. Due to the fact that they are exposed to boys early on with their lives in school, they tend to have no problems in being more friendly to strangers and mixing around with boys. Some had gone overboard and went to the extent of having dreamy thoughts of boys in their school for their relationships. I had a few students who were talking about boys 24/7 in their and they were like picking apples (which are the riper ones) to start a relationship with.
But its undeniable that a minority of these girls exhibit a sense of maturity in socializing with the people from opposite sex, as expected because of their early exposure.
Age group 17-25 (Form 5 - University)Really once when someone grows up, their level of maturity usually goes up with them. Except for some special cases

As for this group I think you all know the answers more than I do.
English Educated (Private school,SMKs you name it )Age group 14-17 (Form 2 - Form 5)Personally, I hail from a english speaking community and school life so I'd try not to be biased here. Convents are our main issue here as they make up a bulk of the population of the girls in this group. Well, what can I say? Having only girls to be with in their school life and usually going out for functions in school is the only way for them to know boy (friends). Once the friendship starts to kick off, they spend their time with their newfound friend in cinemas,hanging out and eventually maybe becoming a couple.
So, the main difference here is between the girls above is that English educated girls do their socializing outside of school with boys. And isn't that what we always do when we're in a date?
As for the rest of the age group, you guys/girls give a shot at it and it'll be interesting to read