Keep shares or sell them to pay off credit card

CalumHeath

Sell your shares and pay off your debt. You'll wish you did if the value of them drops.

JimmyTheWig

I know that they are credit builder cards, but it would be worth contacting the two card companies where you have zero balance and see what deal they'd offer you on a balance transfer.
Not likely to be a market leading 0% deal, but they should be able to offer less than 18%.