I stopped reading the replies since the RP argument began...
Anyway, Oja is just an easier place to move around in general, very open and spacey but also has the right features for great RP opportunities (stalls, taverns, kitchens...and other nick-picks).
With training places and mining places nearby, who wouldn't like this place?
Yeah, I'm just against going to Hydlaa right now, it's so big and winding that I get lost in every direction I turn. And when its so big, how can you find people anyway? At least in Oja you can basically see where most people are and can keep track of the NPCs
And that's my two cents.