Oof, this vote is tough.
On one hand, I do really like the idea of having Biyu be a more constant character in the narrative later on down the line, which makes the first option more appealing; even if one doesn't expect Ling Qi to just stay at home doing paperwork all the time—which I don't—the reality is that a wandering Biyu is simply going to be less available than one staying closer to home. I'm already sad that Hanyi isn't around atm.
On the other hand, the idea of Adventurer Biyu, going out and exploring the world, coming back with pictures and stories of all the places she's been, sounds absolutely fantastic. It would mean less overall Biyu presence, but the presence she would have could be so very evocative and fascinating that it may well make up for it.
Since I can't decide based on effect, I'm going with the actual dream I like more, so...
[X] Endless glittering lights, like droplets of dew on a spiderweb, catching the morning sun, stretching out too far for the eye to see, a constellation here on the earth to match the sky(Gives Biyu a dream of wanderlust, of traveling far and wide)
This is beautiful imagery that the other option doesn't really match. I'd like to have this dream, please.