I can see different financial benefits that SAHMs and WOHMS get - help with childcare costs for WOHMs, and NI contributions paid for SAHMs, for example. I am not sufficiently financially astute to be able to work out which group gets more financial support - maybe others can work this out.
But, having been a stay at home mother for almost all of my children's lives, what I noticed was not the financial differences per se, but the respect or value that I felt they represented - and I definitely felt undervalued as a SAHM. I felt as if I was doing an important job, that was not being seen or recognised by society in general, because it didn't have a price-tag attached. Because I wasn't earning anything, I didn't feel that society thought I was worth anything - and so I thought that a payment of some sort to SAHMs would redress this - but I did know that this wasn't going to happen.
I also felt, when child benefit was taken away, that this took away the last financial contribution that I was making to our household, even though I knew that many other families needed it far more than we did, because dh earns a good wage. Sometimes I look at my particular circumstances, and wonder if the Government would like to take anything more away from my family. Dh has a marginal tax rate of 62%, we have lost all child benefit, our children are not entitled to any help beyond the bare minimum with university, and due to changes with pension schemes, dh will see none of the money he has paid into his scheme for the whole year.
On the question of WOHMs vs SAHMS, it has always been my belief that people do what they believe to be best for their family, and you cannot judge their choices because you don't know their circumstances. Being a SAHM was the best choice for me and my family, but in no way does this mean that it would be the best choice for every family - far from it - and I respect all parents for taking the right decisions for themselves and their families. Being a SAHM is not an easy choice, and neither is being a WOHM - the difficulties are different, but still there, and both roles deserve equal respect, imo.