In my opinion, Houdini could be stronger because Houdini 6 is the same copy of Stockfish 8. Komodo 13 could be less stronger or more stronger. I prefer Houdini, it is well a copy of Stockfish and Stockfish is strong. Houdini could be stronger but just as
@WordL said you could use Komodo 13 if you want to have an originality.