Batman said:
I'd prefer that it would be Barry first, then have it focus on Wally for the rest of the film while taking over the mantle after him.
The way i see it is, make,
at least, a trilogy with Barry Allen being the Flash.
Kill him at the end of the last movie, and continue the franchise with Wally taking over the legacy.
What you have to put in perspective is, what do you want to do!
Is it a movie about the Flash, or about the powers of the Flash.
If you want to make a movie about how cool the powers are and how he can kick the villains ass, well, let´s face it, it can be anyone behind the mask, may it be Wally, Barry, Jay...hell, even the kid next door.
But, if you really want to make a
FLASH movie, if you want to make audience understand the character, feel for the character, get to know the legacy and all that jazz, well, i´m sorry to be so foward, but it´s really stupid to make a movie about Wally West, when the first Flash was Barry Allen (yeah, yeah, Jay was the first, but the comics started with Barry, so, Jay can be a retired superhero when it all starts).