Xenia, I have 2 brothers.
1 of us was educated 11-18 at a private school.
1 from 11-16 state (ex secondary modern comp), 16-18 private.
1 from 11-18 state (ex secondary modern comp, 6th form college).
All of us went to Oxbridge, all got 2:1s or 1sts.
All of us speak the same way (accent is largely a function of home life, not school).
All of us do 'socially useful / creative' work (again, I would suggest that this is due to the value system instilled in us by our parents, rather than due to our education).
None of us regard what we earn as a measure of our success, and partly as a result our relative and absoute earnings have hugely varied over the years. At the moment, I suspect one brother (the state eucated one) is marginally better paid than the other two of us, but I was the best paid for some time, and my other brorther has boom years and less boom years due to his line of work [he is, however, the only one of us who is nationally known in his field].
All of us have, at some point, been SAHPs or had SAHPs as partners (again, a value system instilled in us by our early life - that early education is crucial) and all of our children are academically able and look likely to follow similar 'life paths' to us. All of us are, and remain, happily married (again, an early value system based on the very happy, extremely equal, partnership of our parents).
Apologies if we don't fit your neat pigeonholes. The greatest influence on children's success seems to be NOT buying education or not buying education - it is a set of values and a support system provided by family background from the earliest years.