A petrol (gasoline) engine offers several advantages over diesel. For example the engines tend to be lighter and cheaper than their diesel counterparts. Petrol engines also tend to have higher horsepower, and the fuel is more readily available.
A dual-clutch transmission (DCT) is an automated manual transmission that allows the driver to control gear-shifts themselves or to let the computer decide. Upshifts are extremely fast, resulting in smooth acceleration, and due to the uninterrupted power flow it also has the benefit of increasing fuel efficiency.
This allows all four wheels to move up and down independently, providing a smoother ride when, for example, going over bumps in the road.
Four-wheel drive is a system where torque is distributed to all four wheels of the vehicle. It is beneficial in some circumstances such as providing increased traction in tricky weather conditions, but is most suited to off-road driving.
Front-wheel drive is the most common type of drivetrain and offers several advantages. It is cheaper to manufacture (reducing the cost of the vehicle) and also lighter which helps improve fuel economy. Due to having the weight of the engine over the drive wheels it also benefits from increased traction.