Can we all agree that "impacted" is worse than both of those? It provides no clear information about what is actually happening, relying on the entire audience to make the "aha, we're being laid off" connection themselves. "Impacted" appeared five times, "Affected" once, but it was left to the recipients' imaginations to figure out what they were actually being impacted by. Finally, they get around to framing it as "not being offered a role in the new organization"--another euphemism. I mean, it's one thing to soften the message a little when bearing bad news, but "impacted" is softened to the point of uselessness. George Carlin had a bit[1] about this.

1: https://www.youtube.com/watch?v=h67k9eEw9AY