The Aprilia RS 660 is a excellent choice if you want a powerful, athletic ride. Its 660cc, liquid-cooled, DOHC, 4-valve engine can produce up to 95.2 hp and 67.5 Nm of torque at its maximum output. It has a slipper clutch and a six-speed transmission. The The Aprilia RS 660 is perfect for touring and has a strong power-to-weight ratio. On the other hand, individuals seeking a lightweight, maneuverable, and reasonably priced ride can consider the KTM RC 390. It is powered by a 373.2 cc single cylinder engine that produces a maximum power of 43.5 bhp and 37 Nm of torque. It is equipped with a six-speed gearbox and a slipper clutch. For motorcyclists looking for a light and agile ride, the KTM RC 390 is fantastic. Both the Aprilia RS 660 and the KTM RC 390 have outstanding features and performance, making them the best choices for riders explore an unique riding experience. For those seeking a rougher ride, the Aprilia RS 660 is a superior option because it has a more potent engine and more features.