Should I buy Far Cry New Dawn or A second copy of Far Cry 5 for co op?

I recently just beat Dying Light with my wife which had amazing coop progression. She really loves Borderlands so I got her excited about Far Cry New Dawn but the reviews aren't making me excited to drop 40$. Mind you almost every review has solo play in mind. Just wondering if I should drop the money on New Dawn or buy a 2nd copy of Far Cry 5 since I unfortunately only own a physical copy.

Edit: Thanks for the input so far everybody! Looks like I might pick up a digital copy of Farcry 5 while it's on sale to gameshare and trade-in my old physical copy towards New Dawn.