Actually only the metallic ones are the ones worth getting for production.
The crystalline/asteroids are good for economy.
The arid/gaia are good for research, and the rocky are usually your first bas3.
Rockies are best for production, they have one more fertility instead of their 1 crystal (which aren't worth anything imo).
Asteroids are only good for defense, because crystallines are so far superior on space and crystals.
I recommend to Fiah: Don't try to get a whole system. Everyone want to do that, but you won't get any good result from it. All astros in a system are rarely good, and especially not in those systems.
The only good astros there are... Well, there isn't one single "perfect" one. Your home planet is acceptable, and the gaian moon in orbit 4 is what comes closest to another useful astro, ok for research, but it would had been much better in orbit 1 or 2. I recommend you scout systems carefully if you want useful planets, or look at the astro board on our guild page if you're joining the Blaxian Space State again.