Vans' Told Me....
Asked this very question (along with several others).
They said there is a mostly theoretical difference, that dimpling can be done after priming with no ill effect.
DUES REMINDER: JAN 2023
Wings: In Progress! (Bulk deburring done, most primed, riveting begun)
Engine: Ordered (ETA Late Summer 2023)
Prop: Ordered (ETA November 2022)