My preference is to have a joint account for bills, basically joint living expenses and have separate accounts for personal expenses.
Adjust the contribution to the joint account (and, if necessary, transfers between the personal accounts) so that you have roughly equally spending money.
This gives me an idea of what my fixed living expenses are: that's my contribution to the housekeeping. Savings go out out my personal account as soon as my salary arrives, so that the level of my current account tells me roughly how much spending money I have left.
If the household account starts to build up , we usually plan a holiday or meal out or other treat. It's fun to say ' oh, let's have the household take us out for a meal'. Likewise, if it starts to run low, we can decide to top it up or go easy on it for a while.
Same goes for the personal account.
If there was just one account, I don't think I would have that overview and would cede from spending recklessly to never affording any treats.
If incomes were very different, I suppose I might move over to have one basic account, from which bills, savings etc were funded and which then fed equally amounts into a personal account each.