What are the pros and cons for child's development if their mums are working vs sahm?

Coming from a family with two working parents, I can honestly say that me and my brothers learnt the best kind of independence. We were initially brought up my maternal grandma but she passed. Back then, helpers were not a common thing and my parents both had to work. So at the ages of 9, 7 and 5 respectively, we became latch key kids and "took care" of ourselves. So that's my takeaway from having a mom who's working -- had to grow up really quick and be independent.