Well if we are speaking from experience
Dd (now 20) went to nursery 2 days a week from 9 months. She has never been a bother, always well behaved. Dream child really. She is studying law and is excelling. Never had problems at school or with friends or sharing or anything. She spoke early, potty trained easily .
She lulled me into a bit a false sense of security. We had ds who didn’t need to go to nursery so didn’t until he went half days at school when he was 3. He was quite difficult. Late talker, late and difficult to potty train, did have a temper, developed anxiety in childhood, dd developed it around the same time due to family circumstances. Ds Hated school to the point we took him out for the last few months of primary because he was so distressed each day. Up til 11 parenting him was a struggle. But me and his Dad split up then his dad pretty much disappeared so I put a lot down to that.
He is almost 14. Loves secondary school, never a problem going in, never in trouble, has lots of friends, his anxiety is gone, he is doing well in his subjects. So far he is a dream teen. He tidies up after himself, washes up, walks the dogs without being asked.
What I learned was a lot of it is luck. I don’t think I am an amazing parent. I pretty much do the best I can. There’s things I couldn’t control like their Dad having a some sort of mental breakdown after 15 happy years together and changing his personality over night and refusing help.
Out of all the decisions I have made and had to make, nursery as far as I can see really hasn’t made a difference in the long run. Me working hasn’t made a massive difference because I make sure I turn up and engage with them that’s what’s important. I make sure they know they are the priority and I am there when they need me. As I am the only parent, it’s been hard but they are people are very lucky to be the mother of.
I genuinely think a lot of the decisions we, as parents agonise over (sahp or wohm, nursery/ parent only care, grandparents or child minder etc) aren’t what make the difference. What makes the difference is the quality of time, attention and support you give them outside those things. A sahp could have their child at home until school and be a terrible parent because they don’t actually engage with the child or really parent at all. A working parent could have their child in nursery and be an amazing parent. That’s not the main factor in happy children, in most cases.