Alright, need some suggestions.

Already have Plat, Gold, BBP, Business Delta Reserve, and AA Plat under my belt. Wanted to get my fiancé into the credit card game so that we could rack up points, but she only wants one Amex card, and a backup. Does not want to use more than one, for whatever reason.

I was thinking about doing the Marriot Business card, as it is an "all in one" as far as point earning goes, but I also know there's the argument of that not being the best option either. To be honest, more than happy keeping her on the BBP, but I wanted suggestions from cardmembers with partners that share finances who just absolutely refuse to use more than one card for daily purchases.