Legendary Crafting vs. Pact Commander
I prefer pact commander.
Do you need the Legendary Mastery for the newest Precursor crafting (Eureka forward)? I think Hobbs sells the recipes after the first tier.
This might color your decision.
Good luck.
It really depends on how you play the game. If you are anything like me, you would get the first level of legendary crafting so you can start the collection, and just kind of chip away at it slowly while doing other content. That gives you plenty of time to gather the necessary mastery points to max everything without ever feeling pressured into a grind for MP. If you aren’t like me, then I would say pact commander is a better option because it affects your entire gameplay, not just getting a single weapon or two.
The auto-loot is amazing, although ever since I earned it I’ve been getting disconnect/crashes. It’s pretty rare but it never happened to me before I got it.
21 points allows you to max Pact Commander (auto-loot is really really nice and you will benefit from it right now) AND spend 1 point in Legendaray Crafting, enough for you to start the first tier of collections. This will give you time to eventually get the 17 missing mastery points if you want to max both.
I just went and checked; you only need the first 3 tiers of Legendary Crafting (10 MPs total) to purchase all the recipes for the new Precursors going forward (those you said you may be interested in, some day). Again, this may influence your decision.
Good luck.
Pact Commander is useful. Legendary crafting only if you actually plan to craft a legendary