The only way they "prioritize" them is with the lightning symbol. They don't get better ranking just because they are AMP.
But also, why are you so sure they're not prioritized in the rest of the results? It's very difficult to prove a negative here, and I personally don't trust anything google has said publicly on the matter.
AMP pages aren't faster. They just feel faster when you go through google search and the hidden background pre-load.