It depends on the kid, I guess. I have an independent, creative side to me that also needs strong discipline to get anything done, so I'm grateful to have experienced both worlds. As far as current prices go, my divorced and randomly employed mother was sending both my sister and I there until we opted for the local public school as it fit better with our social lives, and I know there were some kids there in the same boat as us, but overall it was a good mix back then with the benefit of being in the hippy Cambridge of the '70s.
My advice would be to buy the best education for your kids that your money can buy, and unless your local school system is the pits, I wouldn't home-school them. There's a lot to be said for socializing at an early age and teaching the kids subjects in addition to the regular curriculum isn't against the law either. If the kids are smart, they'll put the regular coursework behind them and need the extra teaching anyways.
If the child is a dullard, don't waste too much money on them as you'll need it for later on for when they really fuck up.