We tried one cart for the first few months, but as the wife & I both play golf, we were playing in different groups at the same times. It was a real hassle for one of to call around to find a ride to the course every day. We now have 2 carts and it's working great for us. Certainly, anytime we are going to the same place or playing golf together, we take one cart..
So, 2 carts; one car....