Who to sell?

I pulled a platinum minkah out of my ea play packs today and I already have a regular core elite minkah on my team. To make sure I get the most amount of coins, do I just sell the platnium minkah or do I sell the regular minkah and keep the platinum as a rental?

I would sell the regular one and keep the platinum.  Its value wouldnt go down cause you have the guaranteed coins in the qs. So ita like playing with coins and sell it whenever you want