The DHT22 is the more premium and accurate version of the DHT11. The DHT11 is more common because it’s cheap but if accuracy is important this is the sensor you want to be using. The DHT22 has a temperature accuracy of +/- 0.5°C and humidity accuracy of +/-2%. This sensor is the perfect blend of performance and price. There are more accurate sensors out there but the returns diminish quickly with extra cost beyond this point.
2 x DHT22 Temperature & Humidity Sensor