What’s your money arrangement — what’s mine is mine or what’s mine is ours?

For me, it had always been what's mine is his, and what's his is mine. This would seem like a perfect arrangement to some but in the long run, arguements like who contributed the most or who bought what will somehow caused a strain in the relationship sooner or later. If given the chance, if God permits, in my next marriage, I wouldn't "share" our monies but instead have a separate account + another joint account for savings where we both contribute an equal amount of money.