Using a timer against an update to launch SpriteKit

Question

I am curious what to use for my game. Timer:

let goodFPS = SKAction.wait(forDuration: 0.01666)
let mainGameRunner = SKAction.run {
//my code is here
}
let toRepeat = SKAction.repeatForever(SKAction.sequence([goodFPS,mainGameRunner]))
inGameHighScore.run(toRepeat,withKey:"mainGame")

or update function:

override func update(_ currentTime: TimeInterval){
//my code is here
}

What provides faster approval of updates?

Note: my frame rate is between 45 and 58

Answer 1

I decided to completely rewrite my answer to make it clearer.

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Answer 2

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Answer 3

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If you use the function update, you may know that your logic will be executed after each screen update and no more.