Ready to made or powder alimentium

My baby is 11 weeks old and until recently we were using powder. His poop was mucus like and often. He’s a happy baby and does have reflux so I thought this was normal. Last week I went to the store and they only had ready to feed. Baby still spits up but on the ready to feed he’s starving all the time and poo is smaller amount and less mucus like. I’m unsure what one is better for him. He’s going to a gi doctor for his issue. Anyone on this brand prefer one way or the other?