I'm in a dilemma. Please give me advice.

I plan to get a chronometer. I have a 5 star unduped Colossus and a 5 star unduped Medusa. I could either get a mutant awakening gem, a cosmic awakening gem, get another class awakening gem for a future champion, get 10k 5 star shards, or just chance it the entire way through. I don't want to make the wrong decision, especially because that mutant awakening gem is so valuable since there are just so many great mutant champions in the game. Is Colossus worth the awakening gem or should I save for a future mutant or other class?
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From the feedback on my own recent thread, I'm leaning towards giving it to Colossus.