The best acting technique is the one that enables an actor to achieve their best performance, and that is appropriate for the role and creative vision of the project whether it be a film, a stage play, or any other medium.
While Stanislavski’s method is the most ubiquitous and fundamental technique that all actors study, it may not always be possible to use, or for all actors to understand and utilize effectively. As mentioned earlier, the key is experimenting with techniques and finding what helps you to perform at your best. Always keep in mind that the wider your knowledge of acting and its techniques the more robust your capabilities will be and the easier you will be able to adapt to difficult roles or situations.