Synuefai ZH-D c28-0 4 c vs LHS 417 9 E A - My experience today:
Just got done trying FragMagnet43's suggested Synuefai ZH-D c28-0 4 c then Pristine_Bump's suggested LHS 417 9 E A for an hour each. I like both for different reasons. On each planet, I visted several geological signals. In my experience today, Synuefai ZH-D c28-0 4 c was much much more productive for gathering selenium. In the hour there, I picked up over 120 selenium, but in the hour at LHS 417 9 E A I couldn't get enough selenium to complete the 150 limit. ZH-D c28-0 4 c was overflowing with arsenic, yttrium and zirconuim though.
One visit on one even isn't conclusive of course, but those are more results.
Good find FragMagnet43!
Edit: The third time I got out of the game and back in on LHS 417 9 E A (after the hour), I got another server and RNG improved greatly for gathering selenium! LHS 417 9 E A may be my new favorite too given its proximity to the bubble and the variety of minerals it has.