Even when I was working 2 jobs for a total of 60 hrs a week (7 days/week, the first 10 months of marriage, but he worked 1 job 6 days/week for 70 hrs/week...we had a specific goal, not to do that forever but to prepare for our first child, get out of debt, save for our first house): we always had THE SAME account. Now we have several accounts for different things, but they are all joint accounts, a couple credit cards that are sitting in a file box (in both our names) and the one card we actually use all the time is in both our names.
My husband is a professional planner so he handles the long term stuff (and has me sit down and "learn" it all----which is a lot, and boring, but it's important). I am now a mostly-sahm and am the "home manager" which includes the day to day money management. With our longterm goals in mind, I make the budget and make sure it equals out every month. He works a lot and I do the chores and stuff (including shopping) while he's at work so it stands to reason that I'm more in control of the day to day stuff. Every Sunday I take some time alone and track what's been spent for the week, on what, where, to make sure it doesn't get too far off track. (It's not the same EVERY week, but it will balance at the end of the month). The last Sunday of every month I have him sit down and go over things with him so that he can understand what we're doing. It takes about 10 minutes, because I've already done my part every week prior to make it easy to read/understand. This way we both always know what is coming in, what is going out, etc.
I see how much money is being earned and where it goes: our money market, 401(k), roth and traditional IRAs for both of us, the charitable gift fund, the 529 and college accounts, our "real" bank account (for normal life) and our "taxes and maintenance for our rental property" account (we "pay" our projected taxes: state, federal, properties, etc a year ahead to this account because it has a really good interest rate but is a small branch out of state.....it draws interest all year long, and then we pay taxes when it's due but have earned income from the interest and do it again every year....the "real" account is a major bank that is local, and more for every day use). I work part time and it goes in the same pot, though I have opened accounts in the past where you do direct deposit and get $100 for banking with them....my part time pay went to specific projects like Jeremy's surprise 50th birthday party, or a vacation for the 2 of us, etc. Jer knew about the account and what was in it, but understood it was a project account for us even if he didn't know what the project was. He trusts me and my decisions. Those accounts worked because we don't go into debt and it was going to take awhile to set aside money for a specific thing.
We do have "spending money" budgeted in, but if we spend $100 or more on anything (out of the ordinary: not counting groceries or bills, but some unusual purchase), we tell each other AHEAD of time. Nobody is being "the boss" or whatever, but the accountability is good for us. My husband had a relationship where they had separate everything and there was jealousy and fighting over what's "fair" (percentage-wise), and he had a previous marriage where they had a joint account but did their own thing with no plan and were TOTALLY broke and in debt even though their combined income was very very good. So, he really appreciates joint everything but my attitude of looking at the family expenses as a business that needs to be managed and run correctly, and jointly. This is my first marriage but I saw lots of issues with money in my parents' marriage and divorce. It was one of their main reasons to divorce. I saw mom's side, and I saw dad's side. I think just taking emotion and entitlement out of the equation and looking at it like a business is the best way to "grow the business" of the household budget. That's what works for us.
My husband and I have only had ONE problem with money ever, in a decade, and that was this summer, where some of the charitable gift fund went without discussing it with me and I was freaked out (not that I'm a control freak but that it was the first thing that has ever been behind my back and I felt scared---I didn't like "behind my back".....and when he told me the story, the story "felt" wrong. We had a huge argument, and he changed the passwords (not access to the accounts, but just the passwords to SEE them, for 2 days but changed them back without me asking him too.....just his way of saying "f-you" since he was mad at that moment). We went to counseling over it, and that helped so much, so quickly----we didn't fight or let it fester, we just couldn't see eye to eye so we sought help quickly. That helped set some things straight, and that same week he found out he'd been fooled by that sob story that just wasn't true (the one that just felt wrong). He does respect my gut instinct, and I do respect his desire to help, but we are a team and feel that we need each other to do what's best. So, crisis was averted, situation was fixed. I am very very glad we went to counseling (only 3 sessions, but they really got us back on track). I think money can be very contentious because it's more than just numbers on paper...it can symbolize the work and time people put in, their lifestyle, their hopes and dreams, their respect or trust for each other, a FEELING of security, all kinds of things. Teamwork is the only way I can see it working for a marriage. What that teamwork looks like though is for each couple to figure out (separate accounts and sharing responsibilities works for you, same accounts but sharing goals works for us).