Clarion Vs Thesus

I am torn on which one should be first. I am trying to give Zebs a chance to a degree... start date will effect how things unfold in game time:<div><br /></div><div>I keep changing my mind. Either can work.  Maybe both Colonizied around same time but no one know Clarion has been colonized? So the Date in Zebs is when other humans or races find them? What do you guys think?<br /><div><br /></div><div><br /></div></div>