Let me mention:
-FIRST Robotics Competition is a robotics program (only for high-school students) that involves building autonomous robots to accomplish certain tasks. The high school that I will be attending next year already has a team. If I choose to participate in FRC, I will only be a team member.
-FIRST Lego League is a robotics program (for students in grades 4-8) that involves building autonomous Lego MINDSTORMS robots to accomplish certain tasks on a playing field (mat on a board). Since I will obviously be too old to participate as a team member next year (I am currently a student mentor for a team at my school), I can volunteer to mentor again as a 9th grader next year for the same school, serve as a coach for the same school, or try to start a team at one of my old elementary schools and serve as a coach there.
Which would look better for college admissions? For all options, I can set up a managable schedule to fit in the position, so time is not an issue at the moment. If I try to start a team, I already know that I can apply for a special grant that will help pay for team expenses and enlist nearby STEM buisnesses to help support the teams.