You have a good choice of schools there; am sure anyone you go for will be good for your DS.
We had to choose between Whitgift and Trinity last year for our DS - Trinity were more generous with their scholarship than Whitgift; so we went for them.
My DS changed his mind on regular basis on which of the two was the flavour of the week - so it was easier for us!! Bar our decision to opt for Trinity - he was quite keen on the electronics/robotics club at Whitgift but he was more excited to go to Trinity as they have a model plane flying club.
Another factor was our DS2, currently Yr4, who, though quite bright, is not likely to receive an academic scholarship so we had to factor in paying two lots of fees in the next coming couple of years.
Hopefully you will soon be in the fortunate position of choosing and refusing. Fingers crossed for your family.