I don't think there's any right or wrong choice in this matter. I wouldn't make a judgement on sahm as opposed to working mothers, horses for courses and all that.
I remember being an adolescent at my convent school when it was made apparent by the teachers who were nuns, having a working mother was less than desirable and that was something they reiterated fairly often. My thoughts back then, not expressed obviously. "I have a working mother, she is a good person who is doing the best she can for her family, what would you know a) you've never been a mother, b) had to balance a household budget or c) been out in the cut thrust of working world" That kind of snap judgement stayed with me, either way I wouldn't want to make any sort of pronouncements on what women opt for as there are umpteen variables that come into play for the individual.
I had my first child at 32 and had worked for something in the region of fifteen years, at that time I very much wanted to be a sahm and I did so for probably nine or so years until my youngest went into reception, then I went part time, but working in my husband's business gave me wriggle room as to child hood sick days and school holidays when I could juggle a bit of work from home. In retrospect I was lucky, it wasn't financially imperative that I went back to work. Now, like my mother, for so many women it is, hence the rise of the after school care on school premises that was rater at the time when my children were in infants/junior. When I was a child, my mother went back when I was maybe top juniors it was normal to be a latch key kid then, now that's not really acceptable under say 13 or 14, so childcare has to be found, at enormous cost too.
I understand why some women want to stay at home with their children, I did for quite a while, my days were full I don't remember too much sitting around on my arse unless I was feeding the baby which could be a long protracted process, still not sure how one would juggle that with whatever the job entailed no matter how good a multi tasker. I also can't imagine working, having had say four or more children, or how that is achievable without a live in au pair/nanny, or nearby extended family who would be willing to step up. My son had one such friend, 4 children in the family mother had a very high powered job in the civil service, I never saw her down at the school gates, when my son got invited to a sleep over, invitation that needed to be verified, I rang the home to check to see if that was okay, I spoke to the live in nanny who told me"Mrs x oh she's not here much during the week" So yes without that sort of employed help I imagine, as a mother of say four or more, the logistics of day to day life would be quite difficult to say the least.
I can completely understand the desire of many women to want to return to work, especially if they have worked hard for a professional qualification., or if after a period of time they know that staying at home is driving them up the wall. On the other hand I have a friend who waited until 36 to have her one and only child and her partner expressly wished her to go back to work as soon as, they were financially secure enough for her not to have to. Ultimately it was one of the resentments that led to theit break up, she still laments to this day she had a brief 6 months with her child until he went into a nursery.
Every situation is different and I think we as women should not deride each other's choices. by either suggesting that sahm are lazy, vacuous dossers or that working women don't parent as well as those who stay at home with their children.