Vader has a different costume in each film, so there’s no reason to try to tie them together.

And that shot of Tarkin is one of my favorites in the trilogy! I’d rather have it than the DS about to fire. It’s already shown to be right down to the wire with the countdown over and guys flippin’ switches and all.
If it can only be one or the other, I’d rather have the iconic (yes, iconic!) shot of the films main villain moments before his demise than another reinforcement of urgency that the audience already feels plenty of.