Maybe it depends on whether you expect your kids to go to oxbridge or do medicine, probably easier than at hbs.
How many go to oxbridge from hbs?
What about the fees?
The other thing is that nlcs will have girls there from very wealthy backgrounds where it could be average to go on holiday abroad 3 or 4 times a year, live in a house with a swimming pool, have amazing birthday parties as opposed to parties at pizza hut?
One thing I like about the selectives is that you get kids from a real mixture and some from quite humble backgrounds and others from more wealthy backgrounds.
nlcs will have much longer school holidays.
Sorry, but have to disagree with you. I think there will be as many 'super rich' kids at NLCS as at HBS (why pay for education that might impinge on lifestyle when one can get it for free and still live well) - the majority in both schools will come from the 'squeezed' middle and because of the bursaries that Independents have to offer to retain their charitable status, your child is more likely to come across children from very humble homes at NLCS than at HBS.
My experience at, what was then called Public School, is that uniform was a great leveller and I, for one, was completely unaware of the different backgrounds of my classmates and that some parents were making huge sacrifices to send their daughter to that school - or maybe I was just very naive!