Travel by Subway from Guangzhou airport to Changshou lu subway station.

As for travel from Airport to ChangshouLu station, I wonder why most ppl suggest using Line 3 and than transfer to Line 1, But there is no suggestion using Line 3, transfer to Line 2, and than transfer to Line 1 to reach ChangshouLu station? (this routh seems shorter to me). Pls. correct me if I'm wrong, as I prefer to use the nearest & faster way. Thankyou.