I would say that I prefer Adobe Spark over Sway. I found that it was much easier to use and navigate Spark than it was with Sway. Also with Sway, I think that it was hard to visualize what the final product was going to look like as opposed to with Spark. In Sway you had to add boxes of content and then click on preview to see what the layout really looked like. With Spark it was easier to see in the moment what your page was going to look like. The pictures were the same size when you added them as they were going to be in the final product. I think the products work in a lot of the same ways, but I would prefer to use Spark.