Which SUV should I buy?

Looking at getting a used car approx 2-3 years old with as few miles on the clock as possible. We know that we want an SUV and have narrowed it down to a few choices but wondering if anyone has any advice on these models or any guidance to steer our decision to make sure we get the right car. We are looking to spend between 15-20k and the car needs to be an automatic. Options we are considering are;
Mazda CX-5
Ford Kuga
Honda CR-V
BMW X1

Please offer any advice where you can