I personally prefer Teldrassils concept.
A tree so big, with a crown so dense that it supports its own landscape and ecosystem is a very damn cool idea.
It's just very hard to translate that into the game.
And it also requires quite a bit more time and world building to work than what Teldrassil got.
Amirdrassil pulling a Nordrassil is vastly more managable, consistent and would look a lot better in-game than big ol' magic stumpy.