When deciding on the type of visualization to use, I first consider the purpose of the visualization. This helps me determine whether I'm trying to show a trend, a comparison, or a distribution, for example. Next, I look at the data type, as certain visualizations work better with specific data types, such as bar charts for categorical data or line graphs for time series data. I also take into account the audience's familiarity with different types of visualizations, ensuring that the chosen method is accessible and easily interpretable for them. Additionally, I assess the volume of data to ensure that the visualization remains clear and not overwhelming. My goal is always to present the data in a way that is both informative and easy to understand.