A good rule to follow is if you feel like a viewer is equipped to make a purchase by just remembering one key piece of your proposition, one feature, one benefit, use the Z-pattern since it forces that focus.
If, however, you’re telling a story or want to build your case in more than just one paragraph, the F-pattern is preferable.
As a Web copywriter , this means using as few words as possible, concise, using bullet points where applicable, quickly readable, and removing bias, objective.
So, for you, I want you to take a step back and ask why do I prefer the websites I personally visit?