There is no universal title for the "best player" in gaming. The answer changes completely depending on the specific game, era, and criteria (tournament wins, peak skill, longevity, influence).
To get an accurate answer, you must specify the game. Here are examples of how the "best" is defined in different communities:
Please reply with the specific game title (e.g., "Who is the best Counter-Strike 2 player?"), and I can provide the current community consensus and key contenders.