How do you manage finances in a relationship?

My parents were divorced growing up and I have never had an example of how people manage finances in a relationship. I take care of my finances well, but how does that scale in a relationship? I have been asking a lot of friends who are married or asking my friends how their parents manage finances. In general, I see 3 models.

Model 1) Separate accounts with 1 shared for communal expenses.

Model 2) Breadwinner brings home money and stay-at-home-partner will manage the finances.

Model 3) Breadwinner handles all finances and gives money to the other partner.

Most of my getting-by-decently-married friends seem to be in Model 1) or 2). In general, Model 1) seems to be common amongst couples when 1 of the 2 people is not well educated in personal finance. Of my higher-income married friends, they usually fall into Model 3).

I am interested in different frameworks for decision making in relationships especially with investments, debt, and long term planning. I am also interested in dynamic frameworks that account for asymmetrical incomes between partners. Ex, each partner contributes 10% to a savings account to prepare for a 6-month emergency fund, 10% into an investment account, etc...

I know this is quite a personal subject, but I am just looking to educate myself and prepare myself. I appreciate all answers and insight.

Thank you in advance.