Sinister and Sinister.
Jean
Sinister or Jean. Although, you can't get Sinister from any crystals.
If all things were equal, I'd say Sinister and Jean. But there's a good chance that you pull Jean from a future Titan, and even if you don't, she'll go into the basic pool right after her Titan period. Meanwhile, you won't be able to awaken Sinister without a gem for the foreseeable future. As such, I'd go with Sinister. In fact, I did. I recently used a generic gem on him, specifically because I knew I wouldn't be able to awaken him without one. It seemed like a great investment.
But awakening Jean is my most wanted outcome from every Titan I pull right now.
Sinister and its not even close
Give it to dazzler she's the one who gets the most benefit from it.
Sinister