I think it really depends on the individual childminder and nursery tbh.
I think an excellent childminder is better than an excellent nursery. A good childminder is better than a good nursery. I think probably a good childminder is better than an excellent nursery. Obviously, an excellent nursery is better than a poor childminder.
If you look into child development absolutely all of the evidence points to the best care for children being with a key caregiver, in a small group situation, having their needs met on an individualised (not group) basis.
There is also lots of evidence around brain development and how important new experiences/sights/smells are for them. With that in mind is it best for a child to spend 50 hours a week in a childproof room and garden or is it better to be out in the world?
If you look at socialisation, do babies need to be in a room with others in the same age bracket? Or are they better off mixing with children of all ages, different adults etc.
You have to make the decision that works for you, but I would read up on child development (it's very interesting even if it doesn't inform your childcare choice).