In the book How to Choose a Chess Move by Andrew Soltis, Andrew analyzed high level chess games and counted the number of moves into four categories. Here was the breakdown:

1. Forced moves 6% check with a forced move, forced defensive move, etc.

2. Book moves 28% opening moves following the opening book

3. Clearly best moves 30% there's one clearly best move out of all the moves on the board

4. Discretionary moves 36% there are many best moves, so one person would choose one move, but another person could choose a different move, and neither would be "right"

What does this mean for your playing?

It means that there is not always a best move, and so you shouldn't obsess over trying to find it. You have to accept discretionary moves.

This is what gives rise to chess playing styles.