I was advised on Twitter to post this here for others who might be looking for the same answers I was.
The client wanted to test the user engagement of an auto-play video vs. image slides with a call-to-action. I chose A/B testing over Multivariate testing, because I only needed to switch out one section of my page. I couldn't find many articles or any answers on how to implement dynamic-content split testing with a module or add-on, so I started looking into other non-dynamic options.
Since I am not using Structure in this current project, I had found this helpful article, but couldn't implement it the way the article explained: FortySevenMedia Blog
I was told to look into Google Content Experiments, which looked amazing, but I didn't want to deal with multiple pages/urls, despite that looking like the easiest solution, so had to find something else to use instead. Overview of Content Experiments