One who wishes to know

[Wardad]

Definitely, the extraction facilities are the way to go. For really long games you might want to scrap one extraction facility at a time and replace it with a monolith. Hopefully by then you will have a spaceyard 3 on the planet to speed up the build time.

The robotoid facilities are much more expensive to build than the (mineral) scanners. The scanners cost more research points to discover.
The robotoid will boost production of all three resources. So overall your better off with the robotoid facility.
BTW, be carefull how many you try to build at once, you could run out of rads and organics.

Only the best bonus is used, but the planet bonus and system bonus do add up.
ex,
planet bonus of +10, +30, +30 = +30.
System bonus of +10, +20, +30 = +30.
total bonus of +60

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So many ugly women, so much time. Got Beer?