They are very different cards, and I am keeping them both (for now).
- UA Club Card - I fly out of ORD constantly, and I'm too accustomed to the lounges to let go of this. What I will say is that if you regularly drink at the airport, this card's savings will rack up quickly for you. If you're only in it for the food, I'd rather just pay for regular food in the terminal than depend on the club lounge buffet. But for me it's just a nice routine of coffee/breakfast on my outbound morning flights, and beers/snacks on my afternoon return flights.
- CSR - For my everyday spend and flexible UR points, this card is invaluable. 3x points on travel/dining rack up quickly for us, and you can always transfer them into UA if you find a good redemption. But I also use these for Hyatt hotel stays and other airlines.