The best rookie defenceman?

[jonlin]

While Dahlin is amazing, Heiskanen is looking more developed (obviously), and more ready to step into a top 2 role. I don't think the skill gap between the two is as big as a lot of people think

Heiskanen has the advantage to have played against men in a big role for longer. Dahlin has lots of raw potential and will probably be better than Miro in a few years. For now, Miro is hands down better at defence while the two are quite even offensively.