I have both and I promise you Hit Monkey is better. You will use him more and his utility is more widely useful. And he really is a skill Corvus, as you already know. Stealth doesn’t leave the bench anymore. He will get way more done in 6 for you.
Having both at R5, Stealthy's better if you don't have suicides. If you do have suicides, I'd go with Hit Monkey purely because he benefits from them and Stealthy suffers from them.
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Good luck.
Cheers!