I'm looking to make end-of-the-year charitable donations on one of my existing credit cards. Which one do I use?

1. Chase Sapphire Preferred
2. Wells Fargo Propel World AmEx
3. Chase Ink Plus
4. Costco TruEarnings AmEx
5. Chase Southwest Plus (I got this in November. I want to hit this hard with spend in only January, because I want to hit companion pass status in only January without getting it prematurely this December. So I'm holding off on any spend on this card for now!)
6. Chase Southwest Business Premier (same as #5)

I spend $4-$5K a month on credit cards for business stuff, so meeting minimum spend on #5 and #6 isn't a problem at all -- I can do that immediately in January.

I just want do something that gives me the best bang for the buck but I'm really open-minded and flexible. I'm happy to do UR points that I'd then transfer to Southwest or Avios, or I can do cash.

PS: Yes, ideally I should just donate via check or cash, but without going into details, I'll just say that I have to use a credit card to get my business to match my donation and I can't change anything about that.