What is the best engine

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Diakonia

Read through the other numerous posts on your question.

https://www.chess.com/forum/search?keyword=What+is+the+best+engine

hbergson

If you have access to apps, AnalyzeThis with the Stockfish 8 engine is a superb analysis tool and it's free. I bought the premium app largely to support the author. For opening analysis, I use the Chessbase app. Besides this I user the CT-Art tactics training app. That's about it. I watch lots of Banter Blitz on YouTube to learn the art of thinking like a GM.

Shuloon

Don't pay for an engine. Stockfish is free and insanely strong. The only reason to pay for anything better than Stockfish is if you're already a Master.