both eat pods, a mandarin can decimate what one may think is a an overpopulation in many tanks, but the scooter IME eats less and can more easily be weened to brine shrimp, you just have to make sure they get the food, it often floats, so you need to get it down to them, i use a turkey baster for ours, actually if you read my posts, i use a turkey baster for many things, but hey, it is cheap and serves many purposes
HTH