Both are valuable, however the fastest bowlers who topple the charts are the ones who incorporate speed and precision. Fast is not fast enough. As an example, the fastest bowler in the world, Shoaib Akhtar was capable of swinging the ball and bowling to the correct areas. Contemporary fast bowlers such as Jasprit Bumrah might not be the quickest, however, they are lethal due to the control over their namesake. Nonetheless, raw pace may frighten batsmen and makes them scared, this is the reason why such bowlers like Mitchell Starc or Mark Wood are so successful.