0.8 Environment Syntax - objects vs list

Drone Support
1

Is there any advantage/disadvantage to using either syntax:

environment:                                                             
  - VERSION=${DRONE_COMMIT:0:8}                                                                                                                                                                                                      
  - CLUSTER=dev                                                   

environment:                                                             
  VERSION: ${DRONE_COMMIT:0:8}                                                                                                                                                                                                      
  CLUSTER: dev