Choosing the best quote

I am having a difficult time choosing the best quote. I have narrowed 4 quotes down to 2. Both quotes are the same price. The first quote is for Timberline HD shingles (50yr warranty) This quote includes the installation of Deck Armour GAF underlay on the entire roof. The CertainTeed premium quote does not include an underlay. It would be an additional $800 for an underlay on this quote. The company installing the CertainTeed shingles are advising me that their shingles weigh more and as a result is better than the underlay.

I am leaning towards the Timberline quote, but am not 100% sure. If you where the customer, which quote would you decide on?