The Socratic method can be frustrating with one child, because when she doesn't get it, she really doesn't get it, and it takes a lot of questioning to lead her down the right path again. Sometimes you just want to bang your head against the wall when you ask the simplest leading question and she gets it wrong. At least with a group most of the kids will get those questions right.

I think my wife and I use that teaching method quite naturally. I'm never inclined to just give our children the answer; they only learn when they arrive at the answer themselves.