PKX [PEK daXing] has subway and HSR. https://daxing-pkx-airport.com/transportation/

— tcost

• Frequency .. Subway wins
• transfer to taxi .. HHHHHSR wins .. closer to DJDJ
• transfer to central subway network… both require 3 additional trains. HHHHHSR wins.
• HHHHHSR is possibly higher speed.. but gate closes 5 min in advance.
• ticket purchase .. can be done in advance for HHHHHSR
• .. Both tickets are  easy to get. Subway ticketing is fully automated.

— ticket cost .. LG2
HSR .. varies Rmb 21~30, slightly cheaper than subway R35