I think there’s no hard and fast rule. Just do whatever works for you and your spouse as long as its mutually discussed before and agreed on

My wife gets to use in most times unless it's really for something expensive

I use his when we travel becoz I don't take mine normally

He doesn’t need to use mine but I’m okay with it

We do have each others we share on some occasions

Yes, we use each other's card when needed.

Definitely. I trust her spending habits

If there's special promos using my cc

Nope. Just easier to track finances.

Well I mean happy life = happy Wife