We intend to trade in our Audi Q5 2.0 TDI SE soon. Although the car has been reliable, the unsettled ride and the DSG gearbox have made us think twice about owning another Q5. We have dismissed the Range Rover Evoque for its small fuel tank and non-negotiable price. The BMW X3 M-Sport seems a much better car than the Q5 but is more expensive to buy. We would appreciate your views on which is the better car and which is likely to have the best residual value when it reaches three years old.