Kakko for me... I think in his Year #3 (2021-2022) he'll be better than Hischier yearly.
But, I do expect Hischier to be better this year & next.
Kakko is a top line winger... or should get those minutes/production for most of his career.
Hischier is REALLY good... but he is going to be supplanted on C1 by Jack Hughes.
NYR is just going to spend more money annually - which means more support for Kakko all-around.