Best "click here" approach: glow or arrow

I have developed a web-based online game and I am currently working on a tutorial for new users. I wanted to show a "press here" type of element on the page wherever the user is supposed to click/tap. This will be in addition to on-screen text telling the user what to do now.

It seems that there are two approaches in use currently:

  1. A "pulsating glow" around the element
  2. An arrow moving slightly back and forth pointing to the element

However, I can't find anything online indicating the benefits/drawbacks of either approach (I'm only interested in UX aspects, not technical aspects).

Can anyone point me to any research/discussions/opinions about the pros/cons of either approach? If not, can anyone provide me with their own experiences?

Are there any different/better ways of signifying "press here" that are better than either of these two?