Seamless always struck me as the far better option. Here in NYC, radial distance is almost useless to define delivery areas. On GrubHub and Delivery.com, I would often see restaurants on the other side of the river show up as in my area simply because of straight line proximity. Somehow Seamless knows which restaurants actually consider me in their delivery area.

The most curious thing about Seamless was they were constantly running promotions with a code that only worked in their mobile app. I don't know if this was meant to help them test or what, but I think there's a huge risk consumers will interpret that sort of thing as 'penalty for ordering in the comfort of your web browser' instead of 'bonus for ordering with a mobile app'