AVPlayer seek vs AVPlayerItem seek

Question

Which one is more accurate?

• AVPlayer seek(to:)

func seek(to time: CMTime, 
          toleranceBefore: CMTime, 
          toleranceAfter: CMTime, 
          completionHandler: @escaping (Bool) -> Void)

• AVPlayerItem seek(to:)

func seek(to time: CMTime, 
          toleranceBefore: CMTime, 
          toleranceAfter: CMTime, 
          completionHandler: ((Bool) -> Void)? = nil)