There are good and bad schools in both sectors, and so much depends on whether the school is the best fit for your child. Most posters will be posting from the benefit of their own experiences. DH, DD and I went to state schools, so I can only give personal experience of the state school system.
We did consider a private school for DD, so she sat the entrance exam while we applied for a bursary (being eligible for one on paper). She passed the exam with flying colours, but we were refused a bursary. We felt that the significant drop in living standards to pay for her education wasn’t worth it, and sent her to the excellent local comprehensive school, where, as stated in my previous post, she did very well. Also, DD isn’t the least bit sporty, and due to distance and the logistics of getting home from school if she missed the school bus she wouldn’t have been able to do any of the extra curriculars anyway.
Her best friend went to the private school and although she has turned out to be a very confident person, she is also very arrogant and didn’t do as well academically as DD did. Also, the school might have academic excellence up to GCSE level, but they haemorrhage 16 year olds to one of the best sixth form colleges in the country, so their sixth form isn’t very highly rated at all.
Money isn't the focal point many would want you to believe. Private school doesn't 'buy' you a better job
There is at least one poster on this thread who thinks so.