Best card to help authorized user

[Anonymous]

Looking to help bring up my BF's credit score. His credit is currently in low 500s. I've offered to add him to one of my cards, but he will not posess the card. Anyone know which cards report for AU?

I am thinking he should go on my oldest/largest NFCU card that has CL of 20,500. It does carry a $1500 balance that I am paying no interest on until April. So it will be going down. Should I also add him to a comenity/store card? I carry a zero balance on all my store cards. 

Thanks in advance for any help.

[Anonymous]

Old accounts with low util is ideal. The NFCU sounds good but sometimes creditors will not count AU history regardless. That's out of your control, though. Comenity is a subprime lender so not the best choice. If you have a card from one of the big banks, that might be ideal if the age is older than his AAoA

[TURNERHOOVER]

I would think card with longest line of history.