The first criterion that people usually consider when choosing a platform is the price. You will need to decide whether it is worth paying more for a platform with better features or if you are happy with what a cheaper option offers.
The second thing many people consider when choosing a platform is what kind of content they will be creating on it. For example, if you are going to be writing articles or blog posts, then WordPress might be the best choice for you because it has an easy-to-use interface and plenty of plugins for your content needs.