I did Atkins at first and it didn't do much for me. I read the Atkins book again and found out I had to go even lower in carbs (for me, under 10 grams) to lose weight. I found out about the meat & eggs way of eating and I've been doing it ever since.
I think all low carb diets are good for women with pcos but you have to find the one that works for you ;-)
Oh, forgot to mention exercise is important too!