Logitech G502 Hero Vs. Logitech G602
The G502 Hero by Logitech uses a Hero (proprietary) sensor, providing a DPI/CPI range of 100 - 16,000 DPI. This is combined with a 32-bit ARM processor. This results in a tracking speed of 400+ IPS. It uses a USB connection with a 2.1m Braided cable. It weighs in at 121 g without the cable, has 5 x 3.6g weights that can add up to 18g extra weight and is approximately 132 x 75 x 40 mm (LxWxH).
The G602 by Logitech uses an Optical sensor, specifically the AM010, providing a DPI/CPI range of 250 to 2,500 dpi. This results in a tracking speed of 2 m/s - 80 IPS, and a maximum acceleration of >20G. It uses a Wireless/USB connection. It weighs in at 107g grams with the cable, has weights but the batteries can be used as weights and is approximately 139 x 83 x 44mm (LxWxH).