Wife and I trying to unite our finances a bit more - what’s the best course of action?

Me - 733 credit score 1 credit card with 2% CB on everything

Wife - 780 credit score 1 credit card with 1% CB on everything

Essentially we’ve been using my card, as I was the only one working and it has the higher cash back. But now she’s done with school, and we don’t want her using the 1% card or have to keep tabs on two accounts.

What it comes down to is:

1) having her open a new credit card with 2% CB, but now we’ll have two accounts to pay

2) make her joint owner of mine. This would be ideal as it gives her ownership and we only need to keep an eye on one account(generally). Also I know people say it’s rare but I’m fairly confident my card offers this.

3) make her an authorized user on mine. This is good but we’d like her to be building her own individual credit

We are also concerned about how any joining would affect her (higher) credit.

Thanks for your help!