If you book as DL-coded flights, they will earn miles/MQD's based on spend (and MQM's distance). If booked as WS-coded, miles/MQD's will be based on distance (refer to WS earnings table). Note that most economy fares do not earn 100% MQM's (unlike DL marketed flights).
https://www.delta.com/content/www/en...-partners.html
Hopefully with the new DL/WS JV, WS flights will earn 100% MQMs going forward.