It depends what you want your senior project to be useful for. Do you have a good idea of what you want to do after graduation? Then maybe you don't do the career exploration and instead develop a new skill that will be useful for that career. Do you have a developed skill set (or maybe a collection of more random skills), but aren't sure how you can apply them to a job? Then maybe you want to focus more on career exploration. Every senior will have different goals for their project, so don't be too concerned with what your friends are doing. Think about what questions you want to be able to answer once you're done with your project, and design your project to help you answer them.