Need a new roof: Owens Corning Platinum Roofing Contractor VS GC

[Napat Wan]

Hello everyone,

I need some help choosing a roofer. Let me give you a short summary of my situation first. I just bought my first house. It is a single family home in a decent neighborhood. I am planning to stay here for at least the next 5-10 years. After that I will convert it into a rental property. Right now, my whole roof needs to be replaced due to age and small leakage. I have already received 7 quotes ranging from $13k - $22k. The 2 best candidates are a general contractor and an Owens Corning Platinum Roofing Contractor. 

The general contractor proposed $13k for the whole roof replacement with IKO material (can upgrade to Timberline HDZ for $500 extra)  and 10 yr transferrable workmanship warranty. He is a licensed contractor with good reviews and referrals.

The Owens Corning Platinum Roofing Contractor proposed $17.5k for the whole roof replacement with Owens Corning Duration material, 10 yr transferrable workmanship warranty, and transferrable Platinum protection limited warranty ( Lifetime of workmanship warranty with coverage reduced after 25 years based on the age of the roof).

From an investor standpoint, what would add more value to the property? Spending extra for an extended warranty and advertise them when selling the property (would it actually increase the price of the property?) or saving $4.5k?

From a homeowner standpoint, Is the extended warranty worth the paper it is printed on? Can you actually use it?

Please let me know and thank you in advance