DW and I both worked, have always done and probably always will, so I can't really comment from the point of view of a sole breadwinner. Some of my friends are, though.
There should be pros and cons to being the sole earner. The disadvantages are clear: you get to see less of your children, you probably have to put work first more of the time than you would like, you are out of the house for most of the day, you get home very tired and probably just want to put your feet up, the financial pressure is entirely on you so you can't screw up... have I missed anything?
What, though, should the advantages be? Well, primarily, I suppose, it's a big one for the family rather than for you personally - you free up your wife to spend all her time being a wife and mother, rather than having to use childcare. And she can devote time to getting to know other mums, and will have time for things like the PTA and helping out at school events and so on, if that's what you want.
Are there any for you, as a man? Well, I suppose in theory it should mean that you get a lot of say over things. You're the one with the purse-strings, you ought to have a big hand in deciding how the money is spent - and, in theory, you ought to get some free time at weekends.
It doesn't seem to work that way with some of my friends, though. Their wives resent their work, almost as if they are thinking that the man subconsciously wats to be away from the family to evade family duties - which, in most cases, is untrue and unfair.
In the case of one couple I know, the bloke's wife INSISTS that, because he gets a "lunch break" at work, she deserves an hour "to herself" each day as well. Therefore, he has to get up an hour before her and be with the kids before going to work, so that she can have an hour reading in bed or doing her nails or whatever else she wants to do. (Both her children are at school now, so what the fuck she does with herself between 9 and 3 each day is open to debate.) This, I think, is taking the piss, and yet he just accepts it. Possibly because she is a hot yummy-mummy who probably puts out big time.
I've seen it time and again on here, too - "my DH works long hours, wants to put his feet up/go to football/play golf at weekends, am I being unreasonable? Why can't he spend more time at home?" Well, he could, love, but you'd be finding somewhere else to live and cancelling that gym membership pretty sharpish, and learning to get to know Morrisons rather than your beloved Waitrose. It's a trade-off, and you have to accept both sides of the equation.