IMO Talia. She is the only dark side healer unless you unlock Old Daka, and even if you do, healers are valuable. Basically she is a character that you can safely be sure you will need in the future.
I'm at lev 41 and i have the same problem, chewie and talia at 4 stars and dont know what to farm.. Anyway actually, in arena i find Chewie really powerful, pheraps more than talia.. (arena rank 200, still climbing)
Talia instead is important in galaxy wars
I find chewie to be important in galaxy wars for when i need a taunt, so I can bring in glass cannons to burst/one shot important characters or healers. But yea in arena chewie has slowly started to decline a little as I am reaching lvl 40
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Talia instead is important in galaxy wars