>>2855336Simply that ettl is able to.set flash level itself. I have a similar setup to you (70d and 100l), had a 508exii but sold it, and am tossing up what yongnuo flash to get.
I like your pure white background from the LED softbox setup, I just used flash so always had the black background. Yours really pop.
No worries, I know people on pee hate traditional flower shots, but this very minimalist style, and well chosen items appeal to me.