Which is convenience ? Jakarta via Shenzhen or via Dongguan to Chayang, Guangdong ?

Destination is chayang, guangdong.
1. which is better, flight from jakarta-indonesia to shenzhen or guangzhou for above destination ?
2. flight to guangzhou and guangzhou to chayang by flight or train ? how many km by car ?
3. any flight to dongguan ? how many km from dongguan to chayang ?