Ironically I have both, but I only got the indy yesterday. I'd recommend either one.
Lush has nice airflow (very cyclonic, and adjustable, albeit side only) and the JayBo has what is essentially fixed-airflow, although you can alter the top-airflow.
Lush comes with a delrin tip that never gets warm. JayBo is SS and, well it can get warm
Both have nice build decks with a T-positive post. Jaybo negative posts have more flexibility, you can put them in the slits or wrap your leads under the screwhead.
My lush driptip came fused with the air-control piece. My JayBo came with one tiny piece of shaved steel in one of the top-air flow holes.
The JayBo has slightly more build space, and the Lush sleeve will not fit on to the JayBo (and you wouldn't want to go the other way with that due to the height of the JayBo airholes vs the Lush RDA).
If you can only get one, it's a tossup for me right now, but I can also see myself growing to love the indy more over time.
I got both of them for the same price and they are fairly equal performing attys for their price, for that my opinion is worth.