Kostornaya - her results don't lie but not a fan of her crammed Eteri production belt style. Her spins though are incredible I admit. Technique looks sustainable for the future.
But my favourite is Samodurova - for her speed & jumps. I also like Trusova who has lots of natural spark & musicality in her tiny frame. As for the rest - I am either indifferent or pretty sure that I never watched or followed them (Kanysheva?).