Snake will be better for Astarion, or scorpion.
Hmm sorry I don't see it. Astarion will eat anything. If you hear even his party banter he only sees food. Laezel is spicy, Wyll is heroic and his favorite, baldurs gate is sea food, etc. The people that favor Astarion really need to see Curse of Strahd. Its what vampires do in dnd. They lure you to there bidding till they are in the mood to eat. 5e is very clear on vamps, spawn, and thralls. Larian could retcon it though. Who knows.