Originally Posted by
DarthEnderX
On the manga front of differences from the anime(spoilers for the manga, even though it's behind the anime):
They make it clear that Black didn't have access to any of Goku's powers when he first took his body, and the only way for him to gain them was through the Saiyan Zenkai powerup. Which is why Trunks was left alive so long. He'd let Trunks almost beat him, then leave and have Zamasu heal him.
They also mention that Goku and Vegeta's bodies have both already reached the limits of what Zenkai powerups can do for them. They don't get stronger when they almost die anymore.
Also, Goku doesn't stupidly forget the Senzu beans in the manga. Zamasu just destroys them after Goku uses one.
There's also an entirely new subplot about how Trunks survives that day fighting Black and Zamasu alone while Goku is learning the Mafuba.