Which is the best way & economical way from Guangzhou Baiyun airport to Da Gang Garden Hotel.

From the airport, you can take the airport shuttle bus line 7 to Panyu Hotel. Then walk to Panyu Shiqiao bus station to take bus to Tanzhou. After arriving at Tanzhou, you can walk to the hotel. It totally costs within CNY40.
If you take a taxi, the taxi fare would be around CNY140. Usually, the taxi goes by meter. You can try to bargian a fixed price with the taxi driver. Any color of the taxi is OK.