What were the strengths and weaknesses of the Radical Republicans' plan and Andrew Johnson's plan?

During the
Civil War, President Lincoln began formulating a plan to reunify the nation when the war came to
an end. He felt reunification should be a gentle and gradual process. He planned to pardon
Confederates who severed their Confederate ties and took an oath to uphold the US Constitution
and the Union. When 10% of the people who had voted in 1860 in each state had taken the oath,
and when their legislature had abolished slavery, then the state could be readmitted to the
Union.

This plan was countered in 1864 by Radical Republicans in Congress who
thought it too lenient. They proposed the Wade-Davis Bill which said that half the male voters
had to take the oath and repudiate having voluntarily been a Confederate, and the legislature
had to abolish slavery. Lincoln vetoed the bill, saying it was too harsh.

When Lincoln was killed on April 14, 1865 and Andrew Johnson, who was a pro Union Democrat from
Tennessee, became president, he followed in the more lenient direction. He
recognized...