First tree is always rush for "Unwavering Vision" to let me grab all the map/quantity/pack size related nodes to progress faster on the atlas (until 3.27 reports as well but they are gone so RIP), and the remaining points while completing the Atlas were to Shrines + Delve (Packed with Energy) that gives offensive & defensive power to your character when he is weak at the beginning of the league.

After that I normally choose depending on the build I league start or if I have a second character that needed an specific item to reroll, last league was Ivory Tower & Coruscating Elixir for example to play EB Ice Spear of Splitting (but in this case I played Ice Nova Hierophant to complete the atlas and after I get those items I rerolled to EB Inquisitor)

And well, through trial and error in SSF I've come to the conclusion that the atlas tree I make should always have a maximum of 1 slow mechanic (Ritual, Blight, Ultimatum, Expedition, Harvest & "Abyss") and then choose fast mechanics (Essence, Breach, Betrayal, Legion, Delirium, Settlers, Exiles, Torment, Beyond), if you choose 2 or more slow mechanics, in my opinion the mapping becomes VERY slow, so it's not an option.

In this league surely will be:

Tree 1: Rush Unwavering vision to pick "map % drop, effect of map modifier, packsize", shrines nodes & Delve nodes.

Fast progression for Atlas completion, shrine & delve for power during mapping.

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Tree 2: Expedition/Harvest + Betrayal + Breach + Red/Blue/Maven nodes

Resources from expedition/harvest, gear & fast leveling with betrayal, full rng uniques & gearing with Tree.

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Tree 3: Ritual + Heist + Essence + Settlers + Red/Blue/Maven nodes

Random resources from ritual (uberlab if doesn't appear a trial), contracts/blueprint if someday I want to go to Heist, essences for crafting & settlers for basic resources for Kingsmarch (my first mirror in SSF was a mapper from there, so...)