WS-2000 is the newest generation model. It has better sensors. Everything is more accurate. Even the wind vane is better because it doesn't flap around as much and is more dampened. The WS-2000 has the newer better Sensirion SHT30 temperature and humidity sensor. Rain gauge is more accurate and easier to clean. Overall design looks nicer on the WS-2000. WS-2000 does a little better with snow build up. WS-2000 has easy way to put up DIY bird spikes or buy Ecowitt's bird spike kit.