Neither U-Wing is in the meta now, but as ships are changing this week, I'd say wait before committing resources.
Cassian's ship has some great abilities, but since there are so many, the AI won't know how to use it on defense.
Bistan is a reliable target lock before going into stealth, can buff other ships, and has a guaranteed hit while stealthed. Can be very useful in a pinch if you don't have the exact meta or just want to switch it up, and the best part is the AI can't mess it up. However, like Cassian's, it requires gearing multiple toons which are seldom used these days.
But again, I say wait until we see what ships 2.0 has in store for us.
