As PPs have suggested there is a no right or wrong, so long as the child is looked after by a person, or people, who care for them.
I returned to work at 6 months out of necessity (financial), DH stopped work for 6 months to see her through to being a year old.
At 11.5 months she started private day nursery 4 days a week, smallish class (9 kids max) very highly rated, and we're really pleased with the standard of care she receives. She is happy to go every day.
Nursery offers our DD more scope for (very) messy play, socialisation (especially as an only child), music lessons, yoga (I kid you not), etc. than we can easily offer. It also means DH and I can both work, which allows us to live in a nice house, in a nice neighbourhood, and offer her the stability and security we want to.
I feel more comfortable with nursery than a childminder as there will always be 3+ adults in the room with her, leaving her with one other adult would feel more of a risk (not only in case the adult behaved badly, but what if he/she got ill, or had an accident while DD was there). If she didn't enjoy nursery, we'd try the nanny option (ideally a nanny-share to keep costs manageable). If that didn't work, we'd assess our living expenses, and DH and I would change our working hours so as we could share her care during the week.
I sometimes ask myself if I'd prefer to be a SAHP, and in some ways definitely yes, I miss DD a LOT, and if I'm having a slow or frustrating day at work, I can think of nothing I'd like more than going home and picking her up.
But all-in-all, I think we're doing the right thing. I love my job (mainly) it's a big part of my identity (I've built my own business over many years), and I'm responsible for employees and clients, and I don't want to walk away from that. It's also quite a technical role, and I'd miss thinking about technical solutions if I was at home with DD fulltime.