@makeworld tldr is MSTs guarantee at most one chunk boundry update on insert, prolly trees have a (rare) chance to cause "cascade" of chunk boundry updates. Prolly trees are easier to construct when you have sequential keys and do less lookups for sequential reads. MSTs also have more even distribution of items accross layers.

@mauve thanks! If you have any "intro to prolly tree" links you like I'd take those too :)

@makeworld the origibal noms doc about it is great: https://github.com/attic-labs/noms/blob/master/doc/intro.md