I don’t know, I’m glad we got Maul mostly because I think he looks intimidating and because we eventually got his great story arc across TCW and Star Wars Rebels. The man used as a tool of Palpatine and the Sith only to be robbed of his destiny and discarded, left broken for the rest of his life. Grievous on the other hand, nothing interesting was ever really done with him. Also his cyborg design may be perfect for selling action figures to 8 year olds, but it doesn’t fit with the OT aesthetic at all.
Dooku’s still awesome.