A fully joint account offers simplicity: one place to see all household finances, easier bill payments, and full transparency between partners, which works well for couples who prefer a completely merged financial life and trust each other implicitly with spending decisions.
The hybrid approach — separate personal accounts plus one shared account funded by both partners for common expenses like rent, groceries, and joint savings goals — preserves some financial independence, letting each partner manage discretionary spending without needing to discuss every individual purchase, while still handling shared costs and goals collaboratively.
There's no universally correct answer here; it depends on communication style, how equally income is earned between partners, and personal preference around financial autonomy. What matters more than which structure you choose is that both partners have full visibility into the household's overall financial picture, regardless of which specific accounts hold which money.