What is the best Non-Neural Network chess engine?

At least on a single thread, there's hardly any difference between Stockfish 12 with NNUE turned off vs. Stockfish 11. At least not enough to matter...
At least on a single thread, there's hardly any difference between Stockfish 12 with NNUE turned off vs. Stockfish 11. At least not enough to matter...
What is the best Non-Neural Network chess engine?