I think it's a very difficult topic.
On the one hand I accept that its simplistic to say that SAHM care is always better than nursery care, or to make sweeping generalisations.
On the other hand I think it's unlikely that all childcare choices are equally "valid" and the "whatever you decide is best for your child, is best for them" argument. I think it likely that some choices will objectively be better for the child than others; it isn't all just relative.
That leads me on to the logical conclusion that, hard as it may be to contemplate, some parents must be making choices that are objectively worse for their babies than other parents.
Of course not everyone actually has a "choice" - for financial reasons, usually, choice is constrained.
I do think it is important to be able to debate it sensibly and, if there are types of arrangement that are objectively proven to be worse for children, we should know about it, rather than descend into a kind of woolly relativism and say that every choice is equally valid and equally good for children.