Not sure I would base my decision to buy one snake or the other based on feeding frequency. I think it really depends on the age and size of the snake and the size of the prey item. I would think both would have a pretty slow metabolism when they reach adult size. I do know a young retics metabolism is off the charts, they can eat every four days and turn that big rat lump into nothing and look anorexic very quickly. Now that my retic weighs about 35 pounds I feed her an adult rat once every couple weeks or so and she is happy. Of course she is 50% dwarf so she is pretty much full grown at this point. If you fed a full sized retic a small goat or pig they could probably go for months before eating again LOL. If you are considering the costs of feeding and want cheap food you can usually get free roosters (chickens) off of Craig's list.