Are you looking to pay cash or use points? What I"m saying is that I could see Chase advertising $100 as 7000 UR points if you have a Sapphire Reserve. That sounds like $70 but isn't the same thing.
But apples-to-apples, I can tell you that for hotels anyway, AmexTravel.com doesn't always match Expedia or Orbitz. But I almost always book flights direct with the airlines these days because I'm tired of online travel agencies (OTAs) only advertising basic economy until the last page, so i don't have experience with that side of the business.