Choosing between two qualified contractors

[Lana Ly]

I have two great conractors I got references for. I need to change windows in my house. I got one quote 20% less than another. Both use local windows companies and the windows are comparable and the work too. The more expensive one is going to use azack trim for windows and sills. Should I go with the cheaper one? Also, I feel bad contractors spending time on estimates and I need to turn one down :( I would rather pay them for estimates than feeling bad wasting time for one of them especially since they came as a referral.