New Roof Labor Warranty

[Terry Royce]

I am getting a new shingle roof installed on a rehab, and I am wondering what the standard labor warranty is?

I have never had to install a brand new roof.
Some have said 1yr, 5yr, and even 20 yr.
The two I am debating between are
6600 - 1yr warranty
8700 - 20 yr warranty
Both include the same scope of work.
Would the extra warranty be worth the money?

All the contractors were reffered.