We are going to get a new roof and are going with the architectural style shingles. We have gotten estimates from several contractors and have narrowed our choice down to 2. Both of these say the other is offering poor quality shingles compared to their own. The brands are Bird, Tamco and GAF. How do we know which type of shingle is best? Should we go strictly by the warranty? Is there any publication that would rate them for us? We live in upstate NY and the winters are pretty bad. Any help would be greatly appreciated!