Adding my own experience, hopefully it helps:
P7 entry for 10 year old son. Applied into both GW and GH.
We liked both schools, and my preference eventually was GH over GW.. I got the same vibe as described by @Fifeburgh7 Emphasis on hard work and treating everyone with respect. Got the small close-knit family kind of feel.
GW felt a bit more 'posh' (not in a bad way) and was nicer with a very impressive campus and massive facilities and everyone was lovely.
We have an offer from GW and were told high on the waitlist in GH. Learnt today due to high subscription waitlist not moving in GH.
So GW it is. GW is also walkable for us from Morningside over a bus ride to GH.
Cannot go wrong with both schools, so we are happy and moving forward with GW.
On the GH more academic vs GW well-rounded: I am not entirely sure what our 'expectation' is.
Our son currently in P6 is the average kid, high energy, plays tennis, likes Maths and English, is in the top group for English and 2nd from top for Maths. Generally receives positive feedback from teachers but I don't think he is especially very academically minded or competitive 'academics-wise', or at-least 'for now'. He generally enjoys what he is doing.
I am not entirely sure what our expectation is, we just feel both GW and GH are better resourced and can offer more.
What is this 'more'? only time will tell.