Carburetor delima

Right now I have a good problem. I have the choice between a thermoquad or a holley carb. The tq supposidly came off of a lil red express. It has the small primaries. The holley is a 600 vac sec single pump electric choke. They are in about the same condition and they are going on a basically stock 360 in my dart and I am more worried about fuel mileage than anything. Which carb do y'all think is best suited for me??